Q.

The formula unit mass of calcium chloride is


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a

105u 

b

120u

c

115u

d

111u

answer is A.

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Detailed Solution

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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 CaCl2.
The atomic mass of calcium is 40 u and that of chloride is 35.5 u.
Therefore the mass of calcium chloride is 40+35.5×2=111u.
 
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