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 :
$$40\% $$ and $$60\% $$ $$B$$ and $$O$$ respectively
Solution :
Mass of compound taken $$ = 0.48\,g$$
Mass of boron in sample $$ = 0.192\,g.$$
Mass of oxygen in sample $$ = 0.288\,g$$
Percentage of $$B = \frac{{0.192}}{{0.48}} \times 100 = 40\% $$
Percentage of $$O = \frac{{0.288}}{{0.48}} \times 100 = 60\% $$