How many molecules (not moles) of nh3 are produced from 5.01×10−4 g of h2?

Find the number of molecules NH3 produce from the given equation:
7.42 x 10 – 4g H2
Now, let’s start solving this equation:
=> H2 reacts to ammonia and produced 3 to 2
=> Avogrado’s number = 6.02 x10^23
=> 7.42 x 10^/4 H2 times
=> 2.02g H2/1 mol H2 times
=> 3 mols H2/2 mols NH3 times
=> 6.02 x 10^23 molecules NH3/1 mol NH3
=> Thus the answer is 1.35 x 10^23 molecules NH3