An engineer is testing a cryogenic storage dewar containing liquid nitrogen at its boiling point of 77 K.
Over a 24-hour period, a minor thermal leak results in the vaporisation of 420 g of liquid nitrogen.
The specific latent heat of vaporisation of nitrogen is 1.99 × 105 J/kg.
Calculate the thermal energy absorbed by the nitrogen during this vaporisation process.
36 exam-style questions on Edexcel GCSE Physics 14.2 Specific heat capacity and latent heat. Each one has a worked solution and a mark scheme showing where the marks go.