What is the percentage of copper in copper sulfate (CuSO4)?

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Multiple Choice

What is the percentage of copper in copper sulfate (CuSO4)?

Explanation:
Mass percent composition is found by comparing the mass of the component to the total molar mass of the compound. For copper sulfate CuSO4, use the molar masses: Cu ≈ 63.55, S ≈ 32.07, O ≈ 16.00, so the total molar mass is about 63.55 + 32.07 + 4×16.00 = 159.62 g/mol. The copper portion is 63.55 g per mole, so the percent copper is (63.55 / 159.62) × 100 ≈ 39.8%. Using more precise values (63.546 / 159.611) gives about 39.813%, which rounds to 39.81%.

Mass percent composition is found by comparing the mass of the component to the total molar mass of the compound. For copper sulfate CuSO4, use the molar masses: Cu ≈ 63.55, S ≈ 32.07, O ≈ 16.00, so the total molar mass is about 63.55 + 32.07 + 4×16.00 = 159.62 g/mol. The copper portion is 63.55 g per mole, so the percent copper is (63.55 / 159.62) × 100 ≈ 39.8%. Using more precise values (63.546 / 159.611) gives about 39.813%, which rounds to 39.81%.

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