Chemistry
Grade-9
Easy
Question
Formula mass unit of ZnO?
- 18 u
- 10u
- 81 u
- 100u
Hint:
The sum of atomic mass of the elements present.
The correct answer is: 81 u
The formula mass of a molecule (also known as formula weight) is the sum of the atomic weights of the atoms in the empirical formula of the compound.
Formula mass unit of ZnO = (65+16)u = 81u. Atomic mass of zinc is 65u and that of oxygen is 16u.
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