An oxide XO2 has a vapour density of 32. What is the atomic mass of X?

An oxide XO2 has a vapour density of 32. What is the atomic mass of X?

Answer Details

Molecular mass = vapour density X2

Mm of XO2 = x + 16(2) = x + 32

vapour density = 32

∴ x + 32 = 32 × 2

x + 32 = 64

x = 64 - 32

x = 32

∴ the relative molecular mass of X is 32
Relative molecular mass = vapour density × 2