Question

0.48 g of a sample of a compound containing boron and oxygen contains $0.192$ g of boron and $0.288$ g of oxygen. What will be the percentage composition of the compound?

• A. $60\%$ and 40% B and O respectively

• B. 40% and 60% B and O respectively

• C. 30% and 70% B and O respectively
• D. 70% and 30% B and O respectively

Answer 1

Answer: (B)

40% and 60% B and O respectively

Answer 2

(2) : Mass of compound taken= $0.48g$

Mass of boron in sample = $0.192g$

Mass of oxygen in sample =$0.288g$

Percentage of B=$\frac{0.192}{0.48} \times 100 = 40\%$

Percentage of O = $\frac{0.288}{0.48} \times 100 = 60\%$