Question

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.

Answer 1

Sample Total weight of compound = 0.24 g

Weight of boron = 0.096 g,

Weight of oxygen = 0.144 g

Weight percent of boron = `("Mass of element"/"Mass of compound") xx 100`

= `(0.096/0.24) xx 100`

= 40%

Weight percent of oxygen = `(0.144/0.24) xx 100`

= 60%