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# gas stoichiometry question

A foul smelling gas produced by the reaction of HCL and Na2S:

2HCl + Na2S --> 2NaCl + H2S

is collected in and a 1.00 L sample was found.  How many moles were found in the sample knowing the reaction took place under STP conditions and how many grams of HCl are produced by the reaction?

I think some information is missing?  I get 3.25 g HCl which isn't an option..

the choices are

a.) 2 g

b.) 0.82 g

c.) 0.32 g

d.) 8 g

### 2 Answers by Expert Tutors

Robert J. | Certified High School AP Calculus and Physics TeacherCertified High School AP Calculus and Ph...
4.6 4.6 (13 lesson ratings) (13)
1

You can use dimensional analysis.

1.00 L of H2S (1 mol of H2S/22.41 L)(2 mol of HCl/1 mol of H2S)(36.46 g of HCl/1 mol of HCl) = 3.25 g of HCl

I got the same answer as you got.

Thank you very much!

Vicki N. | Top International Teacher, English Foreign Language Certified (TEFL)Top International Teacher, English Forei...
5.0 5.0 (104 lesson ratings) (104)
0

Hi Liz,

If you show your work, I'm sure a tutor will be happy to assist you.

Thanks!

Vicki N.