Question

.
2. Calculate the formula unit
masses of Zno, Na,O, K, CO
given atomic masses of Zn = 65 u,
Na = 23 u, K = 39 u, C = 12 u,
and O = 16 u.​

Answer 1

It is calculated by adding the atomic masses of all the atoms that are present in one formula unit. Calculating the formula unit masses of the given compounds: Hence, the formula unit mass of ZnO is 81u, is 62u and that of is 138u.

Answer 2

ANSWER  :-

The formula unit mass of

(i) ZnO = 65 u + 16 u = 81 u

(ii) Na2O = (23 u x 2) + 16 u = 46 u + 16 u = 62 u

(iii) K2C03 = (39 u x 2) + 12 u + 16 u x 3

= 78 u + 12 u + 48 u = 138 u