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

The correct option is B $40\%$ and $60\%$ B and O respectively

Percent composition of an element in a compound $=\frac{massofelement}{totalmass}\times 100$

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

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