Zn$OH$2
Zinc has a molar mass of 65.38 g/mol
Oxygen has a molar mass of 16.00 g/mol
Hydrogen has a molar mass of 1.01 g/mol

Therefore, the molar mass of Zn$OH$2 = 65.38 + 2$1.01$ + 2$16.00$ = 99.40 g/mol

Al2$SO4$3
Aluminum has a molar mass of 26.98 g/mol
Sulfur has a molar mass of 32.06 g/mol
Oxygen has a molar mass of 16.00 g/mol

Therefore, the molar mass of Al2$SO4$3 = 2$26.98$ + 3$32.06$ + 12$16.00$ = 342.12 g/mol

CaCO3
Calcium has a molar mass of 40.08 g/mol
Carbon has a molar mass of 12.01 g/mol
Oxygen has a molar mass of 16.00 g/mol

Therefore, the molar mass of CaCO3 = 40.08 + 12.01 + 3$16.00$ = 100.09 g/mol

Therefore, the Mr $molarmass$ of Zn$OH$2 is 99.40 g/mol, of Al2$SO4$3is 342.12 g/mol, and of CaCO3 is 100.09 g/mol.