chemistry question

Question

calculate the percent composition for every atom in aluminum carbonate

Answer 1

The percent composition is the percentage of each element relative to the total mass.

Aluminum carbonate = Al₂(CO₃)₃

The molar mass (total mass of 1 mole) = 2x26.99 + 3x12 + 9x16.0 = 233.99 g/mol

% Al = 2 x 26.99 g / 233.99 g (x100%) = 23.1%

% C = 3 x 12 g / 233.99 g (x100%) = 15.4%

% O = 9 x 16 g / 233.99 g (x100%) = 61.5%