Question

The formula unit mass of X₂0 is 62u. Calculate the atomic mass of X. (Given atomic mass of oxygen = 16u).​

Answer 1

Answer:

Formula unit mass is defined as the sum of the atomic masses of all atoms that are present in a formula unit of the given compound.

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

Calculating the formula unit masses of the given compounds:

ZnO = Zn + O

ZnO = (65 + 16)u = 81u

Na2O = 2Na + O

Na2O = [(2 x 23)+16]u

Na2O = (46 + 16)u = 62u

K2CO3 = 2K + C + 3O

K2CO3 = [(2 x 39) + 12 + (3×16)]

K2CO3 = (78 + 12 + 48)u = 138u

Hence, the formula unit mass of ZnO is 81u, Na2O is 62u and K2CO3 is 138u