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Question

The formula unit mass of CuSO4.5H2O is

A
159.62
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B
90.1
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C
249.72
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D
240
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Solution

The correct option is C 249.72
Formula unit mass of CuSO4=1×Atomic mass of Cu+1×Atomic mass of S+4×Atomic mass of O
= 1×63.55+1×32.07+4×16 =159.62 u

Formula unit mass of 5 H2O=5×Molecular mass of H2O
= 5×18 =90 u

Formula unit mass of CuSO4.5H2O=159.62+90=249.70 u

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