a)How many grams of H2 are needed to produce 14.27 g of NH3?

Question

b)How many molecules (not moles) of NH3 are produced from 1.57×10−4 g of H2 ?

Answer 1

You need an equation, then follow the steps in this example problem.
http://www.jiskha.com/science/chemistry/stoichiometry.html

Answer 2

if you have 150g of nano3 how many mole are there