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.
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