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Question

The formula mass of CaCl2 is:


A

71 u

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B

111 u

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C

115.5 u

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D

75.5 u

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Solution

The correct option is B

111 u


Formula mass of CaCl2 = Atomic mass of Ca + (2 x atomic mass of Cl)

= 40 + (2 x 35.5) = 111 u


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