Question

Which one of the following contains the greatest number of atoms?
(Atomic mass of Na=23u, C=12u, Cl=35.5u, O=16u)

Answer 1

Explanation:

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Answer 2

Explanation:

Solution:

Given:

Atomic mass of Zn = 65u

Atomic mass of Na = 23u

Atomic mass of K = 39u

Atomic mass of C = 12u

Atomic mass of O = 16u

The formula unit mass of ZnO= Atomic mass of Zn + Atomic mass of O = 65u+16u = 81u

The formula unit mass of Na2O = 2 x Atomic mass of Na + Atomic mass of O = (2 x 23)u

+16u=46u+16u=62u