An electric steam steriliser is switched on to sanitise baby bottles. The water inside is heated to boiling point and evaporates.
At the start, the mass of the water in the steriliser is 0.80 kg.
After a period of time, the mass of remaining water has decreased to 0.62 kg.
The thermal energy supplied to vaporise the water during this time was 414 000 J414\,000\text{ J}414000 J.
Calculate the specific latent heat of vaporisation of water.
Use the equation: thermal energy for a change of state=mass×specific latent heat\text{thermal energy for a change of state} = \text{mass} \times \text{specific latent heat}thermal energy for a change of state=mass×specific latent heat
36 exam-style questions on Edexcel GCSE Physics 14.2 Specific heat capacity and latent heat, covering 14.2.1 Heating, temperature and changes of state, 14.2.2 Specific heat capacity and specific latent heat, 14.2.3 Specific heat capacity calculation, 14.2.4 Specific latent heat calculation, and 14.2.5 Reducing energy transfer through thermal insulation. Each one has a worked solution and a mark scheme showing where the marks go.