Specific Latent HeatWatch
While a kettle boils, 0.018 kg of water changes to steam.
Calculate the amount of energy required for this change.
Specific latent heat of vaporisation of water = 2.3 × 106 (J / kg).
energy (J) = mass (kg) × specific latent heat (J/kg)
So this question involves multiplying the mass of water (0.018kg) by the specific latent heat of vaporisation (2.3x10^6 J / kg) to give the answer.