How many grams of oxygen are produced when 7.65 moles of water is decomposed

The answer to your question is 122.4 g of O₂

Explanation:

Data

mass of O₂ = ?

moles of H₂O = 7.65

Process

1.- Write the balanced chemical reaction

                   2H₂O  ⇒  2H₂  +  O₂

2.- Convert the moles of H₂O to grams

molar mass of H₂O = 2 + 16 = 18 g

                    18 g of H₂O 1 mol

                      x                 7.65 moles

                      x = (7.65 x 18) / 1

                      x = 137.7 g H₂O

3.- Calculate the grams of O₂

                 36 g of H₂O 32 g of O₂

              137.7 g of H₂O  x

                        x = (32 x 137.7) / 36

                       x = 122.4 g of O₂

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