Question

2. The atomic masses of Zn =65 1 point
u, O= 16 u, then the formula
unit mass of ZnO equals to- *
O 81 u
O 819
O 81mg
81 Kg​

Answer 1

ZnO = (65+16)u = 81u

Na2O = [(2*23)+16]u = (46+16)u = 62u

K2CO3 = [(2*39)+12+(3*16)] = (78+12+48)u = 138u