Question

The mass percentage of o in monovalent metal carbonate is 48%. Find the atomic mass of metal?

Answer 1

Answer: The answer is 20

Explanation: Refer to picture attached for proper explanation

Answer 2

answer : 20 g/mol

explanation : Let us consider that atomic mass of monovalent metal is M g/mol.

then, chemical formula of metal carbonate is $M_2CO_3$

and molecular weight = (2M + 60) g/mol

mass percentage of O in compound = 3 × atomic mass of O/molecular mas of O × 100

or, 48% = 3 × 16/(2M + 60) × 100

or, 48/100 = 48/(2M + 60)

or, 100 = 2M + 60

or, M = 20 g/mol.

hence atomic mass of metal is 20g/mol.