how many moles of hydrogen gas would be produced

If you were to use 25 moles of zinc in this experiment how many moles of hydrogen gas would be produced?In the production of ammonia via the Haber process nitrogen gas is combined with hydrogen gas according to the following reaction:N2(g) 3H2(g) -> 2NH3(g)If 50 moles of nitrogen gas were used in the reaction (and there was excess hydrogen gas) how many moles of ammonia could be generatedYou perform an experiment at 21oC and 1atm of pressure and generate helium gas in the laboratory. What do you expect the molar volume of the helium to be?