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The molecular formula of ZnSO4·7H2O is determined using its molar mass of 287 g mol^-1. What is the percentage mass of zinc in the compound?

1. 22.65%
2. 25%
3. 20%
4. 18%

Correct answer: 22.65%

Solution

The molar mass of ZnSO4·7H2O is 287 g/mol. The atomic mass of Zn is 65.38 g/mol. The percentage of Zn is calculated as (65.38 / 287) × 100 = 22.65%.

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