14. Temperature
A section of Physics, 9702
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Define specific latent heat. A dish containing 7.2 × 10–5 m3 of a substance rests on a laboratory bench. The substance is initially a liquid of density 710 kg m–3. Atmospheric pressure is 1.0 × 105 Pa. The liquid is heated at its boiling point so that it completely vaporises. The increase in the internal energy of the substance during this process is 17.6 kJ. The final volume of the vapour is 0.017 m3. Show that the magnitude of the work done on the substance when it vaporises is 1.7 kJ. Use the information in to calculate the thermal energy Q, in kJ, supplied to the substance to cause it to vaporise. Q = kJ Use your answer in to determine a value for the specific latent heat of vaporisation LV, in kJ kg–1, of the substance. LV = kJ kg–1 The substance in has a specific latent heat of fusion LF. Suggest and explain whether LF is likely to be less than, the same as, or greater than the answer in .
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2024
Paper 4, Variant 2
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