What is the percent mass of calcium in a calcium supplement if 1.33-g of calcium carbonate is extracted from a 2.05-g pill?

Question

What is the percent mass of calcium in a calcium supplement if 1.33-g of calcium carbonate is extracted from a 2.05-g pill?

Answer 1

Calculate molar mass of the Carbonate. It is 100g/mol

if Ca is approx 40g/mol then its is 40 percent of the mass of the total compound. 40/100*100%=40%

use the decimal of that percent and multiply by the mass of the caco3 .4*1.33=.532g Ca

Percent Mass=(fraction / total)*100%= (.532g/2.05g)*100%=25.9%Ca