Calculate the formula unit mass (u) of ${C a C l}_{2}$ .
[ Ca = 40 u, Cl = 35.5 u]

111 u

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101 u

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91 u

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55 u

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Solution

The correct option is A 111 u
$F o r m u l a u n i t m a s s = A t o m i c m a s s o f C a + (2 \times A t o m i c m a s s o f C l) = 40 + (2 \times 35.5) = 40 + 71 = 111 u$

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