The molar mass of copper(II) sulfate, CuSO4, is 63.6 g.

Question

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The question asks to evaluate the statement: 'The molar mass of copper(II) sulfate, CuSO4, is 63.6 g.'

Option 1: True. This would mean CuSO4 has a molar mass around 63.6 g/mol. In reality, copper(II) sulfate contains copper, sulfur, and four oxygens, and their standard atomic masses sum to a much larger value. Therefore, this statement is not correct.

Option 2: False. The correct molar mass calculation is as follows: Cu ≈ 63.55 g/mol, S ≈ 32.07 g/mol, and O4 ≈ 4 × 15.999 g/mol ≈ 63.996 g/mol (often rounded to 64.00 g/mol). Adding these together gives 63.55 + 32.07 + 64.00 ≈ 159.62 g/mol. This is substantially higher than 63.6 g/mol, so the statement is false.

Additional notes: If a student attempts to use a simplified or approximate value for oxygen, the total might still come out far from 63.6 g/mol because the copper component alone is already over 60 g/mol, leaving little room for the rest of the atoms. The most common misstep is confusing CuSO4 with a much lighter compound or forgetting the four oxygens in the formula. In standard textbook practice, CuSO4·5H2O has an even larger molar mass, further reinforcing that 63.6 g/mol is not correct for anhydrous CuSO4.

The molar mass of copper(II) sulfate, CuSO4, is 63.6 g.

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