When 1.045g of calcium oxide is added to 50.0mL of water at 25.0°C in a calorimeter, the temperature of water increases to 32.3°C. Assuming density of solution is 1.00g/mL and a specific heat capacity of 4.19J/g˚C?
What is the enthalpy change (kJ/mol) for the reaction?
CaO(s) + H2O(l) Ca(OH)2(aq)
What is the enthalpy change (kJ/mol) for the reaction?
CaO(s) + H2O(l) Ca(OH)2(aq)
1 Answer
Jan 28, 2018
The heat of reaction is
Explanation:
The energy absorbed by the water is
Since this was due to 1.045g of CaO, which has a molar mass of 56.1 g, the number of moles of CaO used was
Therefore, the heat of reaction is
or. more correctly, -95.3 kJ/mol since the reaction is exothermic.