Calculate the mass fraction of each element in zinc sulfate ZnSO4.

Decision:
1. Find the molecular weight of zinc sulfate:
65 + 32 + 16 * 4 = 161;
2. Let’s find the mass fraction of zinc:
65/161 = 0.4037 (40.37%);
3. Let’s find the mass fraction of sulfur:
32/161 = 0.1988 (19.88%);
4. Let’s find the mass fraction of oxygen:
16 * 4/161 = 64/161 = 0.3975 (39.75%);
Answer: in zinc sulfate, the mass fraction of zinc is 40.37%, the mass fraction of sulfur is 19.88%, the mass fraction of oxygen is 39.75%.