and 
.
[Atomic mass of Zn = 65 u, Na = 23 u, K = 39 u, C = 12 u, 0 = 16 u]
Answer:
(i)
Formula unit mass of ZnO = Atomic mass of Zn + Atomic mass of O = 65 + 16 = 81
u.
(ii) Formula unit mass of Na2O = 2 x 23 + 16 = 46 + 16 = 62u.
(iii) Formula unit mass of 
= 2 x Atomic mass of K + 1 x Atomic mass of C + 3 x Atomic
mass of O
= 2x 39 +1 x 12 + 3 x 16 =78 + 12 + 48 = 138 u.
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