Answer:
The volume of 15.0 grams of H2S at STP is 9.85 L.
Explanation:
1 unit of any gas under STP has volume 22.4 L.
Unit's mass M(H2S) = 2M(H) + M(S)= 2*1.0 +32.1=34.1 g/U
15g * 1U/34.1g= 0.440 U
0.440 U*1L/22.4L= 9.85 L
Hope this helped you :)
Good Luck :D
BTW, If you understand what I am saying and want the more technical answer, take all the (U) and replace it with (Mol) which is an abbreviation for Mole
:D have a good rest of your night
