Question

Calculate the mass percent of calcium in calcium carbonate. Report your answer to at least 3 significant figures. Hint: This calculation is theoretical, and is independent of the data provided. Another way to phrase the question would be: What percentage of the molar mass of CaCO3 is due to the Ca?

Answer 1

40%

Step-by-step explanation:

Molar mass of Ca = 40 gram/mol

Molar mass of C = 12 gram/mol

Mass mass of O = 16 gram/mol

Molar mass of CaCO3 = [40 + 12 + (16 x3)]

= 100 gram/mol

Mass % of Calcium = Ca/ CaCO3

= 40/100

= 40%