Question

Calculate the formula unit mass of zno na2o k2co3 give atomic mass of zn=65u na=23u k=39u c=12u o=16u

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

Answer 2

Answer: The formula unit mass of ZnO is 81u, $Na_2O$ is 62u and that of $K_2CO_3$ is 138u.

Explanation:

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. It is calculated by adding the atomic masses of all the atoms that are present in one formula unit.

We are given:

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:

$ZnO=[65+16]u=81u\\\\Na_2O=[(2\times 23)+16]u=62u\\\\K_2CO_3=[(2\times 39)+12+(3\times 16)]u=138u$

Hence, the formula unit mass of ZnO is 81u, $Na_2O$ is 62u and that of $K_2CO_3$ is 138u.