What are the elements of calcium sulfate? find the mass fraction of each element in this state

Given:
CaSO4 – calcium sulfate

Find:
ω (Ca in CaSO4) -?
ω (S in CaSO4) -?
ω (O in CaSO4) -?

1) Ca – calcium;
S is sulfur;
O is oxygen;
2) Mr (CaSO4) = Ar (Ca) * N (Ca) + Ar (S) * N (S) + Ar (O) * N (O) = 40 * 1 + 32 * 1 + 16 * 4 = 136 ;
3) ω (Ca in CaSO4) = N (Ca in CaSO4) * Ar (Ca) * 100% / Mr (CaSO4) = 1 * 40 * 100% / 136 = 29.41%;
4) ω (S in CaSO4) = N (S in CaSO4) * Ar (S) * 100% / Mr (CaSO4) = 1 * 32 * 100% / 136 = 23.53%;
5) ω (O in CaSO4) = 100% – ω (Ca in CaSO4) – ω (S in CaSO4) = 100% – 29.41% – 23.53% = 47.06%.

Answer: Mass fraction of Ca in CaSO4 is 29.41%; S – 23.53%; O – 47.06%.