Answer:
x mol H2O = 4.50 mol H2O
Explanation:
From the balanced equation, we can see that for every 4 moles of NH3 that react, 6 moles of H2O are formed. Therefore, we can use a proportion to find the amount of H2O that would be formed if 3.00 mol of NH3 reacted:
4 mol NH3 : 6 mol H2O = 3.00 mol NH3 : x mol H2O
Solving for x, we get:
x mol H2O = (6 mol H2O / 4 mol NH3) * 3.00 mol NH3
x mol H2O = 4.50 mol H2O
Therefore, if 3.00 mol of NH3 were made to react with excess oxygen gas, 4.50 mol of H2O would be formed.