Find the percent composition of each element in Ca(ClO4)2

Answer 1

Ca = 40.1 g/mol = 40.1 g Ca/mol Ca(ClO₄)₂

Cl = 35.5 g/mol x 2Cl =71 g Cl /mol Ca(ClO₄)₂

O = 16 g/mol x 8 O = 128 g O/mol Ca(ClO₄)₂

Molar mass Ca(ClO₄)₂ = 239.1 g / mol

%Ca = 40.1 g / 239.1 g (x100%) = 16.8%

%Cl = 71 / 239.1 (x100%)

%O = 128 / 239.1 (x100%)