A polystyrene cup can act as a calorimeter to find enthalpy changes in a chemical reaction
Equation for calculating energy transferred in a calorimeter
Specific heat capacity calculations
In a calorimetry experiment 2.50 g of methane is burnt in excess oxygen.
30% of the energy released during the combustion is absorbed by 500 g of water, the temperature of which rises from 25 °C to 68 °C.
The specific heat capacity of water is 4.18 J g-1 K−1
What is the total energy released per gram of methane burnt?
1.50 g of an organic liquid (Mr = 58.0) underwent complete combustion. The heat formed raised the temperature of 100 g of water from 20 oC to 75 oC.
Calculate the enthalpy of combustion for the organic liquid
Step 1: Calculate the energy released by the organic liquid
Step 2: Calculate the number of moles of the organic liquid
Step 3: Calculate the enthalpy change of combustion