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Consider the following reaction: CaCN2 + 3H2O → CaCO3 + 2NH3 105.0 g CaCN2 and 78.0 g H2O are reacted. Assuming 100 % efficiency, which reactant is in excess and how much is leftover? The molar mass of CaCn2 is 80.11 g/mol. The molar mass of CaCO3 is 100.09 g/mol.