Calorimetry is the measurement of heat changes in a system. It involves the use of a calorimeter, a device that measures the heat transferred between a system and its surroundings. Calorimetry is used to determine the enthalpy change (ΔH) of a reaction, which is a measure of the total energy change in a system.

A reaction releases 250 kJ of heat energy when 2 moles of reactant are converted to product. Calculate the enthalpy change (ΔH) for the reaction.

A 25g sample of water is heated from 10°C to 30°C. The specific heat capacity of water is 4.18 J/g°C. Calculate the heat energy transferred.

\[Q_{water} = m_{water}c_{water}ΔT_{water} = 100 imes 4.18 imes (25 - 20) = 100 imes 4.18 imes 5 = 2090J\]

Let c be the specific heat capacity of the metal.

$ \(ΔH = Q / n = -250,000 / 2 = -125,000 J/mol = -125 kJ/mol\) $