A 0.24 g sample of compound of oxygen and boron was found by analysis to contain 0.096 g of boron and 0.144 g of oxygen. Calculate the percentage composition of the compound by weight.

Explanation

We know that, % of any element in a compound `=("Mass of element")/("Mass of compound") xx 100`
% of boron `=0.096/0.24 xx 100 = 40%`
% of oxygen `=0.144/0.24 xx 100 = 60 %`