Question

0.24 g of sample of a compound of boron and oxygen contains e 0.096 g of boron and 0.144 of oxygen . Calculate the percentage of composition by weight.

Answer 1

1. Mass percent of an element = $\frac{massofelementincompound}{massoftotalcompound}\times 100$

2. Mass percent of boron = $\frac{0.096}{0.24}\times 100=40\%$
3. Mass percent of oxygen = $\frac{0.144}{0.24}\times 100=60\%$