Ammonia is produced from the reaction of nitrogen and hydrogen gases. what volume of hydrogen at stp is required to produce 3.0 l g of ammonia a.33l b.1.1l c.4.5l d.25l

The balanced equation for the formation of ammonia is as follows
N₂ + 3H₂ --> 2NH₃
stoichiometry of H₂ to NH₃ is 3:2
Avagadros law states that at volume of gas is proportional to number of moles of gas at contant pressure and temperature 
therefore molar ratio is equivalent to volume ratio 
hence, volume ratio of H₂ to NH₃ is 3:2
if 2 L of NH₃ requires 3 L of H₂
then 3.0 L of NH₃ requires - 3/2 x 3.0 L = 4.5 L of H₂
volume of H₂ required is 
C.4.5L