Question

Thepercentagecompositionofacompoundis79.9%copperand20.1%sulfur. The mass of a sample of the compound is 160.0 g. What are the masses of the copper and the sulfur in the sample?

Answer 1

Assuming the percentage is by mass $Mass \>of\>copper= \frac {79.9}{100}×160$

=127.84g

$Mass\> of\>Sulphur= \frac{20.1}{109}×160$

$=32.16g$