Hydrogen cyanide (HCN) is a poisonous chemical that is used in the extraction of gold. It
is produced by the reaction of ammonia (NH3) and methane (CH4), and hydrogen gas is a
by-product of the reaction. Write the balanced equation for this reaction, and then
calculate how many grams of HCN will be produced if 15 moles of hydrogen gas are
generated.
It sure looks like CH4 + NH3 = HCN + 3H2
So the equation says you will get 5 moles of HCN. Convert to grams.