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Question

Calculate the formula unit mass (u) of $$\displaystyle { CaCl }_{ 2 }$$.
 [ Ca = 40 u, Cl = 35.5 u]


A
111 u
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B
101 u
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C
91 u
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D
55 u
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Solution

The correct option is A 111 u
$$Formula\ unit\ mass = Atomic\ mass\ of\ Ca + (2\times Atomic\  mass \ of \ Cl) = 40 + (2 \times 35.5) = 40 + 71 = 111\ u$$

Chemistry

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