A high-performance computer cooling loop uses liquid ammonia to absorb heat from a processor.
During a heavy processing load, 18.4 g18.4\text{ g}18.4 g of liquid ammonia at its boiling point is completely vaporised into gas.
The specific latent heat of vaporisation of ammonia is 1.37×106 J/kg1.37 \times 10^6\text{ J/kg}1.37×106 J/kg.
Calculate the energy transferred to vaporise this mass of ammonia. Use the equation:
energy=mass×specific latent heat \text{energy} = \text{mass} \times \text{specific latent heat} energy=mass×specific latent heat37 exam-style questions on AQA GCSE Physics 3.2 Internal energy and energy transfers, covering 3.2.1 Internal energy, 3.2.2 Temperature changes in a system and specific heat capacity, and 3.2.3 Changes of state and specific latent heat. Each one has a worked solution and a mark scheme showing where the marks go.