Answer:
51.3% Ca 48.7% F
Explanation:
MM CaF2 = 40.1+2x19 = 78.1 g/mol
MM Ca = 40.1 g/mol
MM F = 19 g/mol
% Ca = (40.1/78.1) x 100 = 51.3% Ca
% F = 100-51.3 = 48.7% F
