How many samples of hydrogen does a sample of sorbose containing 91g of carbon have?
Q. This is the full question, it should make more sense. Sorbose, C6H12O6, is used in making vitamin C. A sorbose sample containing 91g of carbon also contains __g of hydrogen. The answer that was given to us by the professor is 16g of H. Can anyone explain to me why this is the answer and not 12g, I don't understand, Thank you in advance!
Asked by Daniela - Sat Sep 19 23:17:13 2009 - - 1 Answers - 0 Comments
A. moles C = 91/12.011 g/mol=7.58 moles H = 7.58 x 12/6=15.2 mass H = 15.2 x 1.008 g/mol=15.3 g
Answered by Dr.A - Sun Sep 20 06:23:58 2009
Q. This is the full question, it should make more sense. Sorbose, C6H12O6, is used in making vitamin C. A sorbose sample containing 91g of carbon also contains __g of hydrogen. The answer that was given to us by the professor is 16g of H. Can anyone explain to me why this is the answer and not 12g, I don't understand, Thank you in advance!
Asked by Daniela - Sat Sep 19 23:17:13 2009 - - 1 Answers - 0 Comments
A. moles C = 91/12.011 g/mol=7.58 moles H = 7.58 x 12/6=15.2 mass H = 15.2 x 1.008 g/mol=15.3 g
Answered by Dr.A - Sun Sep 20 06:23:58 2009
How long should a writing sample be for a potential employer?
Q. I am applying for this job where a writing sample is required. I was just taking inventory of my writing samples I could possibly send. I am wondering if there is a limit to how long my writing sample should be? Thanks.
Asked by Enlightenme! - Mon Sep 29 16:34:47 2008 - - 2 Answers - 0 Comments
A. I feel that it should be A4 size.(8.27 X 11.69 inches)
Answered by V.T.V.RAM - Tue Oct 7 11:07:11 2008
Q. I am applying for this job where a writing sample is required. I was just taking inventory of my writing samples I could possibly send. I am wondering if there is a limit to how long my writing sample should be? Thanks.
Asked by Enlightenme! - Mon Sep 29 16:34:47 2008 - - 2 Answers - 0 Comments
A. I feel that it should be A4 size.(8.27 X 11.69 inches)
Answered by V.T.V.RAM - Tue Oct 7 11:07:11 2008
What website can i get a free sample of biore cleansing strips and unclogging scrub?
Q. What website can i get a free sample of biore cleansing strips and unclogging scrub? I really wat to try this product!! And i wanna sample it before i buy it. So plese tell me a website where i can get them as a sample for free! Thanks!! ( =
Asked by Madison - Sun Jul 13 13:48:27 2008 - - 2 Answers - 0 Comments
A. you cant really get them for free but i used to use them and they work GREATTT!!! like super well so go ahead and buy themthe strips work magnificent and the srub works almost as well... ummm and only use the srtips if your pores are like seriously CLOGGED hope i helped
Answered by Opea - Sun Jul 13 14:03:57 2008
Q. What website can i get a free sample of biore cleansing strips and unclogging scrub? I really wat to try this product!! And i wanna sample it before i buy it. So plese tell me a website where i can get them as a sample for free! Thanks!! ( =
Asked by Madison - Sun Jul 13 13:48:27 2008 - - 2 Answers - 0 Comments
A. you cant really get them for free but i used to use them and they work GREATTT!!! like super well so go ahead and buy themthe strips work magnificent and the srub works almost as well... ummm and only use the srtips if your pores are like seriously CLOGGED hope i helped
Answered by Opea - Sun Jul 13 14:03:57 2008
What is the best way of obtaining the purest sample of myoglobin from an extract?
Q. I'm trying to collect a sample of myoglobin from a crude extract of bovine serum albumin. I tried column chromatography (washing the extract with pH 6 buffer first then releasing the myoglobin with pH 7 buffer), but it resulted in a slightly impure sample. Can anyone think of another way of extracting myoglobin? Thanks is advance for your help! Sorry, read the question incorrectly! I need the best way of extracting myoglobin from a sample of myoglobin-rich heart.
Asked by Mary W - Thu Nov 5 17:06:37 2009 - - 1 Answers - 0 Comments
A. How can you get anything other than albumin from serum albumin? You can't. Serum albumin is exactly what is says it is, albumin from the blood. If I was you, I'd try to find out what the impurity was before anything else. sds page will give you the MW etc. It might be easy once you know what that is.
Answered by George C - Thu Nov 5 17:25:22 2009
Q. I'm trying to collect a sample of myoglobin from a crude extract of bovine serum albumin. I tried column chromatography (washing the extract with pH 6 buffer first then releasing the myoglobin with pH 7 buffer), but it resulted in a slightly impure sample. Can anyone think of another way of extracting myoglobin? Thanks is advance for your help! Sorry, read the question incorrectly! I need the best way of extracting myoglobin from a sample of myoglobin-rich heart.
Asked by Mary W - Thu Nov 5 17:06:37 2009 - - 1 Answers - 0 Comments
A. How can you get anything other than albumin from serum albumin? You can't. Serum albumin is exactly what is says it is, albumin from the blood. If I was you, I'd try to find out what the impurity was before anything else. sds page will give you the MW etc. It might be easy once you know what that is.
Answered by George C - Thu Nov 5 17:25:22 2009
How do you get a urine sample from a cat?
Q. I've just found out that my 2 1/2 year old cat has an urine infection and struvite crystals/stones. From now on he will have a special diet but I have to take regular urine samples and bring them to my vet. BUT how do you get a sample from a cat?
Asked by buzybee - Fri Mar 30 13:17:10 2007 - - 20 Answers - 0 Comments
A. you give him a lot of water or milk or whatever cats drink and lots of it...and when u know it is going to pee put a bowl or cup and get it
Answered by Elisa Z - Fri Mar 30 13:20:16 2007
Q. I've just found out that my 2 1/2 year old cat has an urine infection and struvite crystals/stones. From now on he will have a special diet but I have to take regular urine samples and bring them to my vet. BUT how do you get a sample from a cat?
Asked by buzybee - Fri Mar 30 13:17:10 2007 - - 20 Answers - 0 Comments
A. you give him a lot of water or milk or whatever cats drink and lots of it...and when u know it is going to pee put a bowl or cup and get it
Answered by Elisa Z - Fri Mar 30 13:20:16 2007
How do I get a urine sample from my cat without contaminating it?
Q. My cat has UTI problems and the vet has had trouble getting a urine sample from her using a needle and trying to draw it from her bladder. I want to try to get one when she is peeing... but how do I get it without contaminating it? What can I use as a sterile container?? Any ideas? How much of a sample will I need? Do you have to refridgerate it or something? Is there a time period that I have to get it to them to test?
Asked by HugeBulgingBulge - Fri Oct 20 02:35:37 2006 - - 6 Answers - 0 Comments
A. Hi there...there are a few ways to collect a urine sample if direct bladder expressing cannot be done by the vet. Here's a website that offers some excellent suggestions: After the sample is collected and you are unable to bring it to the vet that day refrigerate it with the date and time that the sample was collected with the pet's name and your last name and then bring it to the vet as soon as they are open. The fresher the sample the better the results. Katkor also sells a product that helps collect urine samples in the litter they've created:
Answered by Seattle - Fri Oct 20 04:47:06 2006
Q. My cat has UTI problems and the vet has had trouble getting a urine sample from her using a needle and trying to draw it from her bladder. I want to try to get one when she is peeing... but how do I get it without contaminating it? What can I use as a sterile container?? Any ideas? How much of a sample will I need? Do you have to refridgerate it or something? Is there a time period that I have to get it to them to test?
Asked by HugeBulgingBulge - Fri Oct 20 02:35:37 2006 - - 6 Answers - 0 Comments
A. Hi there...there are a few ways to collect a urine sample if direct bladder expressing cannot be done by the vet. Here's a website that offers some excellent suggestions: After the sample is collected and you are unable to bring it to the vet that day refrigerate it with the date and time that the sample was collected with the pet's name and your last name and then bring it to the vet as soon as they are open. The fresher the sample the better the results. Katkor also sells a product that helps collect urine samples in the litter they've created:
Answered by Seattle - Fri Oct 20 04:47:06 2006
How to find a sample space for a tree diagram?
Q. A telephone sales representative makes successive calls to potential customers, and the result of each call is recorded as a sale (S) or a no sale (N). Calls are continued until either two sales are made (these calls need not be consecutive), two consecutive calls result in no sale , or a total of 4 calls is made. What is the sample space for this situation.
Asked by John M - Mon Sep 14 23:02:00 2009 - - 1 Answers - 0 Comments
A. 1 - two sales are made 2 - two consecutive calls result in no sale 3 - total of 4 calls is made. SS 1 SNS 1 SNN 2 NSS 1 NSNS 1,3 NSNN 2,3 NN 2 n = 7
Answered by Julius N - Wed Sep 16 08:19:57 2009
Q. A telephone sales representative makes successive calls to potential customers, and the result of each call is recorded as a sale (S) or a no sale (N). Calls are continued until either two sales are made (these calls need not be consecutive), two consecutive calls result in no sale , or a total of 4 calls is made. What is the sample space for this situation.
Asked by John M - Mon Sep 14 23:02:00 2009 - - 1 Answers - 0 Comments
A. 1 - two sales are made 2 - two consecutive calls result in no sale 3 - total of 4 calls is made. SS 1 SNS 1 SNN 2 NSS 1 NSNS 1,3 NSNN 2,3 NN 2 n = 7
Answered by Julius N - Wed Sep 16 08:19:57 2009
What is the difference between a convenience and random sample?
Q. Is it a convenient sample if you ask everyone from a certain group to be part of a study? If you select a certain amount of people from this convenient group randomly to obtain a certain sample size, is it considered 'random sampling'?
Asked by helpmehelpyou - Sun Dec 7 14:00:48 2008 - - 5 Answers - 0 Comments
A. Convenience sampling only occurs when you take your sample from a group that's easiest to contact or study, such as asking people from a specific area close to your testing center to participate in your study, or only sampling people in a certain employee database, just because it's more convenient. It causes undercoverage and bias because people from other areas and demographics do not have a chance to respond, and thus overall opinion is skewed. Asking everyone from a certain group to be part of a study wouldn't be convenience sampling, it would be cluster sampling. Selecting a certain amount of people from a convenient group randomly would probably still be classified as convenience sampling, though it could easily be regarded as a… [cont.]
Answered by ANGRY CLAUSE - Sun Dec 7 14:06:37 2008
Q. Is it a convenient sample if you ask everyone from a certain group to be part of a study? If you select a certain amount of people from this convenient group randomly to obtain a certain sample size, is it considered 'random sampling'?
Asked by helpmehelpyou - Sun Dec 7 14:00:48 2008 - - 5 Answers - 0 Comments
A. Convenience sampling only occurs when you take your sample from a group that's easiest to contact or study, such as asking people from a specific area close to your testing center to participate in your study, or only sampling people in a certain employee database, just because it's more convenient. It causes undercoverage and bias because people from other areas and demographics do not have a chance to respond, and thus overall opinion is skewed. Asking everyone from a certain group to be part of a study wouldn't be convenience sampling, it would be cluster sampling. Selecting a certain amount of people from a convenient group randomly would probably still be classified as convenience sampling, though it could easily be regarded as a… [cont.]
Answered by ANGRY CLAUSE - Sun Dec 7 14:06:37 2008
How long can you sample a song before you have to pay the artist?
Q. I heard that you can sample a song for bar before you have to pay the artist. If this is true then how long is 16 bars?
Asked by Gregory P - Tue Jan 27 23:43:01 2009 - - 1 Answers - 1 Comments
A. If your sample is recognizable as coming from another song, then it can constitute copyright infringement. There is no time limit or grace period. I've heard that even three notes could be considered copyright infringement, if they're recognizable as being lifted from a different song. In practice, you only need clearance from the artist if you are selling the tracks, ie, making money off of them in recorded form. You don't need clearance to perform material and play samples from other songs. Saul
Answered by Saul - Wed Jan 28 01:47:12 2009
Q. I heard that you can sample a song for bar before you have to pay the artist. If this is true then how long is 16 bars?
Asked by Gregory P - Tue Jan 27 23:43:01 2009 - - 1 Answers - 1 Comments
A. If your sample is recognizable as coming from another song, then it can constitute copyright infringement. There is no time limit or grace period. I've heard that even three notes could be considered copyright infringement, if they're recognizable as being lifted from a different song. In practice, you only need clearance from the artist if you are selling the tracks, ie, making money off of them in recorded form. You don't need clearance to perform material and play samples from other songs. Saul
Answered by Saul - Wed Jan 28 01:47:12 2009
How to write a sample of a formal letter indicating this 5 subjects?
Q. We should write a sample of a formal letter in the request of an employee with indicating these 5 subjects to introduce the employee to an oganization: 1.The position of an employee, 2.The duration that the employee has worked there( from date DD/MM/YY to date DD/MM/YY). 3.The number of hours that the emplpyee has worked in that company. 4.The status of work : full time employee 5.The employee's salary We should write it as an employer who wants to introduce an employee to an organization with indicating these 5 subjects.
Asked by pinkgirl298 - Wed May 7 07:27:53 2008 - - 3 Answers - 0 Comments
A. If I understand correctly, the employer is introducing the employee to ANOTHER company, so the letter is a reference? If so, then the first answer you received is not the right sort of letter. I think you need something more like this: Dear Ms Smith I am writing in reply to your request (dated 6 May 2008) for a formal reference for Mr Jones. Mr Jones was employed by Old Company Ltd in the position of Sales Assistant. His employment with us started on 1 April 2005 and his contract terminated on 30 April 2008. Mr Jones was employed on a full-time basis, working 40 hours per week. Mr Jones' base salary was 20,000 plus our company's standard package of employment benefits, including a non-contributory pension. Yours sincerely Ms Pink … [cont.]
Answered by Tom W - Wed May 7 07:43:59 2008
Q. We should write a sample of a formal letter in the request of an employee with indicating these 5 subjects to introduce the employee to an oganization: 1.The position of an employee, 2.The duration that the employee has worked there( from date DD/MM/YY to date DD/MM/YY). 3.The number of hours that the emplpyee has worked in that company. 4.The status of work : full time employee 5.The employee's salary We should write it as an employer who wants to introduce an employee to an organization with indicating these 5 subjects.
Asked by pinkgirl298 - Wed May 7 07:27:53 2008 - - 3 Answers - 0 Comments
A. If I understand correctly, the employer is introducing the employee to ANOTHER company, so the letter is a reference? If so, then the first answer you received is not the right sort of letter. I think you need something more like this: Dear Ms Smith I am writing in reply to your request (dated 6 May 2008) for a formal reference for Mr Jones. Mr Jones was employed by Old Company Ltd in the position of Sales Assistant. His employment with us started on 1 April 2005 and his contract terminated on 30 April 2008. Mr Jones was employed on a full-time basis, working 40 hours per week. Mr Jones' base salary was 20,000 plus our company's standard package of employment benefits, including a non-contributory pension. Yours sincerely Ms Pink … [cont.]
Answered by Tom W - Wed May 7 07:43:59 2008
What will the final volume of the sample be if the temperature is held constant?
Q. A sample of oxygen that occupies 2.5 10 6 mL at 655 mm Hg is subjected to a pressure of 1.11 atm. What will the final vol- ume of the sample be if the temperature is held constant? Answer in units of mL.
Asked by Inga B - Mon Oct 26 21:50:27 2009 - - 1 Answers - 0 Comments
A. This is Professor McGregor...Please don't post your Chemistry questions online...Your Quest is assigned for individual use not public.
Answered by 1991 - Mon Oct 26 21:54:05 2009
Q. A sample of oxygen that occupies 2.5 10 6 mL at 655 mm Hg is subjected to a pressure of 1.11 atm. What will the final vol- ume of the sample be if the temperature is held constant? Answer in units of mL.
Asked by Inga B - Mon Oct 26 21:50:27 2009 - - 1 Answers - 0 Comments
A. This is Professor McGregor...Please don't post your Chemistry questions online...Your Quest is assigned for individual use not public.
Answered by 1991 - Mon Oct 26 21:54:05 2009
Can a sample of an abscess be taken @ home and brought into your doctors office?
Q. My 8 month old son has been getting absesses since birth in various areas. The doctor reccommended that once this new infection started to drain that he be brough in and a sample be taken. I was just curious in case it stopped draining, if we could collect a sample of the fluid on a clean swab and place it a ziplock bag?
Asked by armebarbie24 - Tue Jun 17 19:50:18 2008 - - 3 Answers - 0 Comments
A. No. The swab is put in a special medium that keeps the bacteria alive so they can tell what it is and what it is susceptible to. As long as the abscess has not scab-ed over they should be able to get a culture.
Answered by Royce Ann M - Tue Jun 17 20:14:01 2008
Q. My 8 month old son has been getting absesses since birth in various areas. The doctor reccommended that once this new infection started to drain that he be brough in and a sample be taken. I was just curious in case it stopped draining, if we could collect a sample of the fluid on a clean swab and place it a ziplock bag?
Asked by armebarbie24 - Tue Jun 17 19:50:18 2008 - - 3 Answers - 0 Comments
A. No. The swab is put in a special medium that keeps the bacteria alive so they can tell what it is and what it is susceptible to. As long as the abscess has not scab-ed over they should be able to get a culture.
Answered by Royce Ann M - Tue Jun 17 20:14:01 2008
What is the molarity of the sample of sodium hydroxide? and the pH at the stoichiometric point?
Q. A 17.60-mL sample of sodium hydroxide solution is titrated to the stoichiometric point with 20.00 mL of a 0.296 M solution of HCl. What is the molarity of the sample of sodium hydroxide? What is the pH at the stoichiometric point for the titration ?
Asked by Help Please - Mon Nov 2 19:10:09 2009 - - 1 Answers - 0 Comments
A. C of SampleHa= C of titrant MOH*V titrant/V sample so .296M* .020/.0176=.336 the pH=7
Answered by unknown - Tue Nov 3 22:46:52 2009
Q. A 17.60-mL sample of sodium hydroxide solution is titrated to the stoichiometric point with 20.00 mL of a 0.296 M solution of HCl. What is the molarity of the sample of sodium hydroxide? What is the pH at the stoichiometric point for the titration ?
Asked by Help Please - Mon Nov 2 19:10:09 2009 - - 1 Answers - 0 Comments
A. C of SampleHa= C of titrant MOH*V titrant/V sample so .296M* .020/.0176=.336 the pH=7
Answered by unknown - Tue Nov 3 22:46:52 2009
How long does a water sample taken from a certain water site degrade?
Q. How long does it take for a water sample (Polluted water) from a creek or river degrade?
Asked by Jay M - Sun Mar 23 02:11:55 2008 - - 2 Answers - 0 Comments
A. From the moment you take it.To bottle it traps co2 and other gases. to remove it form the source may warm or cool it. shaking, jarring.Haven't done this in a long time but we would immediately take o2/co2 reading&pH(usually in the source itself with a probe),guess color,smell,no tasting,no feeling ,refrig a swirreled portion,take a veg sample, take a liquid sample.Actually I think we refrig all samples.Degradation at the lab is a variable that I didn't doanything about.If you are a concerned citisen ask lab first.
Answered by patches - Sun Mar 23 03:31:25 2008
Q. How long does it take for a water sample (Polluted water) from a creek or river degrade?
Asked by Jay M - Sun Mar 23 02:11:55 2008 - - 2 Answers - 0 Comments
A. From the moment you take it.To bottle it traps co2 and other gases. to remove it form the source may warm or cool it. shaking, jarring.Haven't done this in a long time but we would immediately take o2/co2 reading&pH(usually in the source itself with a probe),guess color,smell,no tasting,no feeling ,refrig a swirreled portion,take a veg sample, take a liquid sample.Actually I think we refrig all samples.Degradation at the lab is a variable that I didn't doanything about.If you are a concerned citisen ask lab first.
Answered by patches - Sun Mar 23 03:31:25 2008
Where can I find a sample of a good electronic document retention policy?
Q. There seems to be a great deal of information about what you should and should not do on the internet. I am working in a manufacturing company which makes hair and skincare products. I would like to find a good sample electronic document policy for my industry.
Asked by bdpwsc - Wed May 9 13:42:54 2007 - - 1 Answers - 0 Comments
A. Here's a few sites you may find of use in your research:
Answered by pepper - Wed May 9 16:35:16 2007
Q. There seems to be a great deal of information about what you should and should not do on the internet. I am working in a manufacturing company which makes hair and skincare products. I would like to find a good sample electronic document policy for my industry.
Asked by bdpwsc - Wed May 9 13:42:54 2007 - - 1 Answers - 0 Comments
A. Here's a few sites you may find of use in your research:
Answered by pepper - Wed May 9 16:35:16 2007
What happens on the molecular level when a sample of liquid water is heated from 50 degrees Celsius to 60 ?
Q. What happens on the molecular level when a sample of liquid water is heated from 50 degrees Celsius to 60 degrees Celsius? Likewise, when the sample is boiled?
Asked by Chelsea - Fri Oct 10 10:41:18 2008 - - 3 Answers - 0 Comments
A. As you add heat (energy) the particles begin to move faster, causing them to stretch the chemical bonds between molecules that holds the liquid together. Adding enough heat to break these bonds allows the energized molecules to escape the liquid, forming water vapor. The molecules of a gas can be as much as 1000 times as far apart as the molecules of a liquid of the same substance.
Answered by Adam W - Fri Oct 10 10:47:41 2008
Q. What happens on the molecular level when a sample of liquid water is heated from 50 degrees Celsius to 60 degrees Celsius? Likewise, when the sample is boiled?
Asked by Chelsea - Fri Oct 10 10:41:18 2008 - - 3 Answers - 0 Comments
A. As you add heat (energy) the particles begin to move faster, causing them to stretch the chemical bonds between molecules that holds the liquid together. Adding enough heat to break these bonds allows the energized molecules to escape the liquid, forming water vapor. The molecules of a gas can be as much as 1000 times as far apart as the molecules of a liquid of the same substance.
Answered by Adam W - Fri Oct 10 10:47:41 2008
How many grams of carbon were in the original sample that underwent combustion?
Q. A certain compound, is known to contain carbon and hydrogen. It might also contain oxygen. A 2.910 g sample of this compound was burned in pure oxygen gas. The measured amount of CO2 produced was 6.393 g, while that of H2O was 3.489 g. No other products were produced in the reaction. How many grams of hydrogen were in the original sample of the above question ? What is the empirical formula for the compound in the above question ?
Asked by Zahra - Tue Nov 10 09:24:14 2009 - - 2 Answers - 0 Comments
A. mass of CO2 = 6.393.g =6.393/44 moles of CO2 = 0.1453 also moles of C = 0.1453 and mass of C = 0.1453 X 12 = 1.7436 g mass of H2O= 3.489 /18 = 0.1938 moles; moles of H = = 0.1938 * 2= 0.3876 moles or 0.3907g C + H = 1.7436+.3907 = 2.1343 Mass of O = 0.7757 or 0.04848 moles ratio of C:H:O = 0.1453 :0.3876 :.04848 dividing by the smallest (.04848) we get C:H:O = 3:8:1 empirical formula is C3H8O
Answered by unknown - Tue Nov 10 09:42:22 2009
Q. A certain compound, is known to contain carbon and hydrogen. It might also contain oxygen. A 2.910 g sample of this compound was burned in pure oxygen gas. The measured amount of CO2 produced was 6.393 g, while that of H2O was 3.489 g. No other products were produced in the reaction. How many grams of hydrogen were in the original sample of the above question ? What is the empirical formula for the compound in the above question ?
Asked by Zahra - Tue Nov 10 09:24:14 2009 - - 2 Answers - 0 Comments
A. mass of CO2 = 6.393.g =6.393/44 moles of CO2 = 0.1453 also moles of C = 0.1453 and mass of C = 0.1453 X 12 = 1.7436 g mass of H2O= 3.489 /18 = 0.1938 moles; moles of H = = 0.1938 * 2= 0.3876 moles or 0.3907g C + H = 1.7436+.3907 = 2.1343 Mass of O = 0.7757 or 0.04848 moles ratio of C:H:O = 0.1453 :0.3876 :.04848 dividing by the smallest (.04848) we get C:H:O = 3:8:1 empirical formula is C3H8O
Answered by unknown - Tue Nov 10 09:42:22 2009
Finding the mass of sulfate sample to produce precipitate?
Q. A series of sulfate samples is to be analyzed by precipitation as BaSO4. If it is known that the sulfate content in these samples ranges between 20.0% and 55.0%, what minimum sample masss should be taken to ensure that a precipitate mass no smaller than 0.300 grams is produced?
Asked by Desperate - Tue Jul 8 11:46:21 2008 - - 1 Answers - 0 Comments
A. 0.300g/(20.0%) = 1.50 g 1.50g sample mass should be taken to ensure that a precipitate mass no smaller than 0.300 grams is produced.
Answered by Hahaha - Tue Jul 8 14:44:14 2008
Q. A series of sulfate samples is to be analyzed by precipitation as BaSO4. If it is known that the sulfate content in these samples ranges between 20.0% and 55.0%, what minimum sample masss should be taken to ensure that a precipitate mass no smaller than 0.300 grams is produced?
Asked by Desperate - Tue Jul 8 11:46:21 2008 - - 1 Answers - 0 Comments
A. 0.300g/(20.0%) = 1.50 g 1.50g sample mass should be taken to ensure that a precipitate mass no smaller than 0.300 grams is produced.
Answered by Hahaha - Tue Jul 8 14:44:14 2008
How many grams of NaCl are present in a sample of the solution containing 2 kg of water?
Q. How many grams of NaCl are present in a sample of the solution containing 2 kg of water? A 3.638 molal solution of NaCl is prepared. How many grams of NaCl are present in a sample of the solution containing 2 kg of water?
Asked by Lawrence - Sat Sep 19 22:48:44 2009 - - 2 Answers - 0 Comments
A. moles = concentration(Molar) x volume(litres) n(NaCl) = 3.638M x 2L n(NaCl) = 7.276 m(NaCl) = n(NaCl) x M(NaCl) m(NaCl) = 7.276 x (23 + 35.5) m(NaCl) = 7.276 x 58.5 m(NaCl) = 425.646 grams That's my answer. Hope it Helps
Answered by unknown - Sat Sep 19 23:34:22 2009
Q. How many grams of NaCl are present in a sample of the solution containing 2 kg of water? A 3.638 molal solution of NaCl is prepared. How many grams of NaCl are present in a sample of the solution containing 2 kg of water?
Asked by Lawrence - Sat Sep 19 22:48:44 2009 - - 2 Answers - 0 Comments
A. moles = concentration(Molar) x volume(litres) n(NaCl) = 3.638M x 2L n(NaCl) = 7.276 m(NaCl) = n(NaCl) x M(NaCl) m(NaCl) = 7.276 x (23 + 35.5) m(NaCl) = 7.276 x 58.5 m(NaCl) = 425.646 grams That's my answer. Hope it Helps
Answered by unknown - Sat Sep 19 23:34:22 2009
How is it possible to have less of a sample at the end of an experiment?
Q. The title pretty much says it all. How is it possible to have less of a sample after fully completing an experiment in which it was utilized? For example, I start out with 10g of SoO2 then having maybe 6g by the time I'm completed with my experiment. Let's says it was combined with other samples, heated, and then recovered by physical means.
Asked by Rei - Thu Sep 27 19:49:17 2007 - - 3 Answers - 0 Comments
A. Impossible, but your sample could be elsewhere (in the form of a gas, wasted during scraping or perhaps you measured incorrectly.
Answered by smilam - Thu Sep 27 19:53:07 2007
Q. The title pretty much says it all. How is it possible to have less of a sample after fully completing an experiment in which it was utilized? For example, I start out with 10g of SoO2 then having maybe 6g by the time I'm completed with my experiment. Let's says it was combined with other samples, heated, and then recovered by physical means.
Asked by Rei - Thu Sep 27 19:49:17 2007 - - 3 Answers - 0 Comments
A. Impossible, but your sample could be elsewhere (in the form of a gas, wasted during scraping or perhaps you measured incorrectly.
Answered by smilam - Thu Sep 27 19:53:07 2007
From Yahoo Answer Search: 'sample'
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