July 06, 2022, 07:09:08 PM
Forum Rules: Read This Before Posting

### Topic: question in chemistry  (Read 1971 times)

0 Members and 1 Guest are viewing this topic.

#### manutd732

• New Member
• Posts: 6
• Mole Snacks: +0/-1
##### 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.
1)2710 grams
2)227 grams
3)2.59 grams
4)2.24 grams
thanks!

#### sjb

• Global Moderator
• Sr. Member
• Posts: 3641
• Mole Snacks: +220/-42
• Gender:
##### 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.
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?

#### manutd732

• New Member
• Posts: 6
• Mole Snacks: +0/-1
##### 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.

#### sjb

• Global Moderator
• Sr. Member
• Posts: 3641
• Mole Snacks: +220/-42
• Gender:
##### 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?

#### SeoXvi

• Very New Member
• Posts: 1
• Mole Snacks: +0/-0
##### 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.