Question

Copper reacts with oxygen to produce copper oxide in oxidation reaction. If the mass of Copper before the reaction was 5 g.
Predict what the mass of copper oxide will be

Answer 1

Answer:

2Cu + O2 ----> 2CuO

2      : 1         ::  2

5/63.5    : ?

Oxygen used in this reaction =  5/65.5 * 1/2 = 0.038 or 0.04 moles of O2

Cupper oxide produced in this reaction = 5/65.5 *2/2 = 0.076 or 0.08 moles

Molecular wt of CuO= 65.5 + 16 = 81.5

One mole of CuO = 81.5 g

0.08 moles           = ?

81.5 *0.08 = 6.52grams

6.52 grams of CuO is formed

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