Answer to Question #248560 in General Chemistry for grey tyrant

Question

7. What is the mass of oxygen combine with 15.76 g of gold in a sample of gold oxide, AuO2?

Answer 1

The molar mass of O₂ is 32.00 g/mol

The molar mass of Au is 196.97 g/mol

Solution:

Balanced chemical equation:

Au + O₂ ⟶ AuO₂

According to stoichiometry:

(15.76 g Au) × (1 mol Au / 196.97 g Au) × (1 mol O₂ / 1 mol Au) × (32.00 g O₂ / 1 mol O₂) = 2.56 g O₂

Answer: 2.56 grams of oxygen (O₂).