Question

uestions
1. Calculate the molecular masses
of H, O, CL, CO, CH, CH,
CH, NH, CH,OH.
2. Calculate the formula unit
masses of ZnO, Na 0, K,CO,
given atomic masses of Zn = 65 u.
Na = 23 u, K = 39 u, C = 12 u,
and 0 = 16 u.​

Answer 1

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