The formula unit mass of calcium chloride is

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105u

120u

115u

111u

answer is A.

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Detailed Solution

The formula unit mass of calcium chloride is 111u.
A substance's formula unit mass is the sum of the atomic masses of all atoms in a formula unit of a compound. The formula of calcium chloride is

CaC l_{2}

.
The atomic mass of calcium is 40 u and that of chloride is 35.5 u.
Therefore the mass of calcium chloride is

40 + 35.5 \times 2 = 111 u

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