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Topic: question in chemistry  (Read 1879 times)

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Offline manutd732

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question in chemistry
« on: December 20, 2013, 09:10:12 AM »
FeS(s) + 2HCl(aq) --> H2S(g) + FeCl2(aq) how many grams of FeS(s) we need in order to get 63.2 litres H2S(g)?
more info: the pressure is in atmosphere and the temperature is 25 °C.
what is the correct answer?
1)2710 grams
2)227 grams
3)2.59 grams
4)2.24 grams
thanks!

Offline sjb

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Re: question in chemistry
« Reply #1 on: December 20, 2013, 09:52:23 AM »
FeS(s) + 2HCl(aq) --> H2S(g) + FeCl2(aq) how many grams of FeS(s) we need in order to get 63.2 litres H2S(g)?
more info: the pressure is in atmosphere and the temperature is 25°C.
what is the correct answer?
1)2710 grams
2)227 grams
3)2.59 grams
4)2.24 grams
thanks!

Do you know any equations that link volume and mass for a gas?

Offline manutd732

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Re: question in chemistry
« Reply #2 on: December 20, 2013, 10:02:08 AM »
yea : 8.31 J/mol•K = 0.0821 L•atm/mol•K = 62.4 L•mmHg/mol•K
but I don't know how to use it in order to solve.

Offline sjb

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Re: question in chemistry
« Reply #3 on: December 20, 2013, 10:05:17 AM »
yea : 8.31 J/mol•K = 0.0821 L•atm/mol•K = 62.4 L•mmHg/mol•K
but I don't know how to use it in order to solve.

That's just a number - can you use it in an equation? Does it have a symbol?

Offline SeoXvi

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Re: question in chemistry
« Reply #4 on: December 31, 2013, 12:04:04 AM »
Think of an equation that connects Preasure, Volume, no. of moles, univeRsal gas constant, and Temperature. ;)

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