Question

What is the percent of chlorine in a pure sample of calcium chloride?

Answer 1

Formula of calcium chloride is CaCl₂

Let us take one mole of it

molar mass of it is equal to (40+35.2*2)=111 grams

mass of chlorine contained in it is equal to 71 grams

so percentage of chlorine is $\frac{71}{111}\times100=63.96\%$