Question

What mass of water can be made from 24 grams of oxygen and 16 g of hydrogen?

Answer 1

Answer:

             27.025 g of H₂O

Explanation:

The Balance chemical equation is

                                   2 H₂ + O₂ = 2 H₂O

Step 1: Calculate Limiting Reagent

Moles of H₂

                        Mole = 16 g / 2.02 g/mol = 7.937 mol

Moles of O₂

                        Mole = 24 g / 32.00 g/mol = 0.750 mol

Mole ratio of H₂ : O₂ is 2 : 1. Hence, 7.937 mol of H₂ will need 3.9685 mol of O₂. This means O₂ is limiting reagent.

Step 2: Calculate Moles of H₂O

0.750 mol of O₂ will produce 1.50 mol of H₂O because the mole ratio of O₂ : H₂O is 1 : 2.

Step 3: Calculate mass of H₂O

                          Mass = 1.50 mol × 18.02 g/mol = 27.025 g of H₂O