Question

1. A compound has 45 g of iron, 6 g of oxygen, and 3 g of sulfur. Find the percent of each element.

2. A compound has 3 g of sodium and 5 g of bromide. Find the percent of each.

Answer 1

1) Formula of percentage composition willl be -

Mass % =$\dfrac{mass}{total\ mass}\times 100$ %

Mass % of iron = $\dfrac{45}{54}\times 100=83.33$

Mass % of oxygen =$\dfrac{6}{54}\times 100=11.11$

Mass % of sulphur = $\dfrac{3}{54}\times 100=5.55$

2) Mass % =$\dfrac{mass}{total\ mass}\times 100$ %

Mass % of sodium =$\dfrac{3}{8}\times 100=37.5$

Mass % of bromide = $\dfrac{5}{8}\times 100=62.5$