A 0.150 mol sample of hydrated copper(II) sulfate, CuSO4·5H2O, is heated until all water of crystallization is removed. How many moles of water molecules are released?
Show the answer and explanation
Correct answer
B. 0.750 mol
Principle or equation
The formula CuSO4·5H2O indicates that each formula unit contains 5 water molecules. Therefore, the amount of water is 5 times the amount of the hydrate.
Why this answer is correct
Multiply the amount of hydrate by the number of water molecules per formula unit: 0.150 mol × 5 = 0.750 mol.
Example
For 0.200 mol of Na2CO3·10H2O, water released = 0.200 × 10 = 2.00 mol.
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