Question

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

Answer 1

Mass of compound of oxygen and boron = 0.24 g 

On analysis, 

Mass of oxygen in the compound = 1.44 g 

Mass of boron in the compound = 0.096 g

Weight percentage of oxygen in the compound =\(\frac{Mass\,of\,oxygen}{Mass\,of\,compound}\,\times\,100=\frac{0.144}{0.24}\,\times\,100=60\)%

Weight percentage of oxygen in the compound = \(\frac{Mass\,of\,boron}{Mass\,of\,compound}\,\times \,100 =\frac{0.096}{0.24}\,\times100\) = 40%