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ZnCO3 ==> ZnO + CO2
ZnO + 2HCl ==> ZnCl2 + H2O
mols ZnCO3 = grams/molar mass = ?
1 mol ZnCO3 gives 1 mol ZnO
1 mol ZnO produces 1 mol ZnCl2.
grams ZnCl2 = mols ZnCl2 x molar mass ZnCl3.