Using the thermochemical reaction equation CaO + H2O = Ca (OH) 2 + 67 kJ, calculate the mass

Using the thermochemical reaction equation CaO + H2O = Ca (OH) 2 + 67 kJ, calculate the mass of calcium oxide if 119.4 kJ is released

1. Let us determine the chemical amount of calcium oxide that enters into interaction, making a proportion according to the data of the thermochemical equation of the reaction:

the reaction of 1 mol of CaO releases 67 kJ of energy;

when reacting x mol CaO – 119.4 kJ;

x = 1 * 119.4: 67 = 1.7821 mol;

2.Calculate the mass of calcium oxide:

m (CaO) = n (CaO) * M (CaO);

M (CaO) = 40 + 16 = 56 g / mol;

m (CaO) = 1.7821 * 56 = 99.8 g.

Answer: 99.8 g.