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
Practise Edexcel GCSE Physics Heating, specific heat and latent heat with exam-style questions for Foundation and Higher tier. 81 questions, matched to the Edexcel GCSE Physics (1PH0) specification and written in Paper 1 and Paper 2 style. Every question includes a full worked solution and mark scheme, so you can see where marks are awarded rather than just whether you got the answer right.