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Topic: moles, grams, mole ratio unit changer  (Read 5482 times)

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Offline vicereine

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moles, grams, mole ratio unit changer
« on: July 14, 2008, 10:00:42 AM »
The carbon dioxide that is exhaled by astronauts who are on a space shuttle is scrubbed by pumping the air through canisters of lithium hydroxide, LiOH. The chemical equation for this reaction is:

2 LiOH(s) + CO2(g) -> Li2CO3(s) + H2O(l)

a) What mass of carbon dioxide can 1.00 kg of lithium hydroxide absorb?

b) What mass of lithium carbonate, Li2CO3, is produced?

I checked online to see if I did it right and actually found 2 posts with the same question, however both say something different than I got:

http://au.answers.yahoo.com/question/index?qid=20080404104720AAAEYM0
http://answers.yahoo.com/question/index?qid=20071115173257AApduDa

My answers are in the attachment, if someone could let me know if I got it right or not!

Offline DrCMS

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Re: moles, grams, mole ratio unit changer
« Reply #1 on: July 14, 2008, 10:24:46 AM »
a) looks OK
b) check the molecular mass of lithium carbonate

Offline Borek

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Re: moles, grams, mole ratio unit changer
« Reply #2 on: July 14, 2008, 10:34:03 AM »
Upper frame - initial data. Lower frame - results.
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Offline vicereine

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Re: moles, grams, mole ratio unit changer
« Reply #3 on: July 14, 2008, 10:41:18 AM »
a) looks OK
b) check the molecular mass of lithium carbonate

oops I didn't edit that part, I had forgotten the 2 for Li2 in the initial calculations, the answer is supposed to be 1543.93 g

ps how many decimal points should I use, just one?

Offline Borek

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Re: moles, grams, mole ratio unit changer
« Reply #4 on: July 14, 2008, 11:02:01 AM »
How many significant digits in 1.00?
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