2H2 + O2 - > 2H20

What is the mass of water that is produced from 4.00 moles of oxygen gas reacting with hydrogen

gas?

144.08 g of H₂O

Explanation:

The balance chemical equation for the synthesis of water is as follow;

2 H₂ + O₂ → 2 H₂O

Step 1: Find out moles of H₂O produced as;

According to balance chemical equation,

1 mole of O₂ produced = 2 moles of H₂O

So,

4 moles of O₂ will produce = X moles of H₂O

Solving for X,

X = 4 mol * 2 mol / 1 mol

X = 8 moles of H₂O

Step 2: Calculate Mass of H₂O as;

Mass = Moles * M. Mass

Mass = 8 mol * 18.01 g/mol

Mass = 144.08 g of H₂O