help me please and thank you

Question

How many molecules (not moles) of NH3NH3 are produced from 1.76×10⁻⁴ gg of H2H2?

Answer 1

The are NO molecules and NO moles of NH₃ produced from H₂. It is impossible to produce NH₃ from H₂. Perhaps you meant to ask how many molecules of NH₃ are produced from the reaction of 1.76x10^-4 g of H₂ with excess nitrogen gas (N₂). That being the question, we can approach it as follows:

N₂ + 3H₂ ==> 2NH₃ ... balanced equation for the reaction

moles H₂ present = 1.76x10^-4 g x 1 mol H₂ / 2.02 g = 8.71x10^-5 mols H₂

moles NH₃ produced = 8.71x10^-5 mols H₂ x 2 mols NH₃ / 3 mols H₂ = 5.81x10^-5 mols NH₃ produced

5.81x10^-5 mols NH₃ x 6.02x10²³ molecules / mole = 3.50x10¹⁹ molecules of NH₃ produced