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Q.

What is ZnO (Zinc oxide)formula mass unit? (Atomic mass of Zn= 65 u, Atomic mass of O=16 u)

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a

188 u
 

b

88 u

c

81 u

d

18 u

answer is B.

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Detailed Solution

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 The formula unit mass of ZnO is calculated as the sum of the atomic mass of zinc, i.e. 65u and the atomic mass of Oxygen, i.e. 16u. 

The atomic mass of ZnO=65+16=81u.

Hence, the value comes out to be 81u.

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