chemfw
https://www.chemfw.com/products/zinc-sulfate-heptahydrate-monohydrate-cas-no-7446-20-0-7446-19-7/
1. Chemical Name: ZINC SULFATE MONOHYDRATE/ZINC SULFATE HEPTAHYDRATE
2. Molecular Formula: ZnSO4.H2O/ ZnSO4.7H2O
3. Molecular Weight: 179.49(Monohydrate)/287.58(Heptahydrate)
4. CAS: 7446-19-7(H2O)/cas 7446 20 0 (7H2O)