Question

How many grams of hydrogen are necessary to react completely with 2.3 moles of nitrogen, in the reaction N2+3H2 = 2NH3?

Answer 1

4.6 g

Explanation:

1. Starting from moles of nitrogen, we'll find the moles of hydrogen using the stoichiometric coefficient (the number in front of compounds in the balanced equation).
2. then, from the moles of hydrogen, we'll use molar mass of hydrogen to find the mass of hydrogen.

Here's how we can set it up,

`"mass of hydrogen"="2.3 mols " N_2*("3 mols "H_2)/("1 mol "N_2)*((2*1)"g/mol")/("3 mols "H_2)=4.6 g`