gas stoichiometry question

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

 

Please help me or let me know what is missing!  Thanks!

Answer 1

You can use dimensional analysis.

You start with what's given:

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.

Answer 2

Hi Liz,

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

Thanks!

Vicki N.