Question

It is found that 16.5g of metal combine with oxygen to form 35.6g of metal oxide.Calculate the percentage of metal and oxygen in the compound.

Answer 1

% Oxygen = 16.5/35.6 = 46.3%

% metal will be 100-46.3 = 54.7

Answer 2

in 35.6 g of metal oxide, mass of metal is 16.5 g, thus mass oxygen is 35.6 -- 16.5 = 19.1.    now the %age oxygen is 19.1/35.6*100=53.6% and %age of metal is 100--53.6=46.4