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Question

Calculate the mass of a formula unit of the complex FeSO4.7H2O in unified atomic mass unit.

A
230 u
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B
250 u
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C
278 u
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D
270 u
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Solution

The correct option is C 278 u
The atomic mass of iron (Fe) = 56 u, sulphur (S) = 32 u,
Oxygen (O) = 16 u, hydrogen (H) = 1 u

So, the molecular mass of the complex FeSO4.7H2O
=(56+32+11×16+14×1) = 278 u

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