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

Md Ariful Islam

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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).

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