The formula unit mass of $C u S O_{4} .5 H_{2} O$ is

159.62

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90.1

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249.72

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240

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Solution

The correct option is C 249.72
Formula unit mass of $C u S O_{4} = 1 \times A t o m i c m a s s o f C u + 1 \times A t o m i c m a s s o f S + 4 \times A t o m i c m a s s o f O$
= $1 \times 63.55 + 1 \times 32.07 + 4 \times 16$ $= 159.62 u$

Formula unit mass of 5 $H_{2} O = 5 \times M o l e c u l a r m a s s o f H_{2} O$
= $5 \times 18$ $= 90 u$

Formula unit mass of $C u S O_{4} .5 H_{2} O = 159.62 + 90 = 249.70 u$

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