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14.2 Specific heat capacity and latent heat

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Question 27

Steam at 100 ∘C100\ ^\circ\mathrm{C}100 ∘C condenses to water at 100 ∘C100\ ^\circ\mathrm{C}100 ∘C. Energy is transferred from the steam at a steady rate of 45 kW for 2.0 s. Assume that all the energy transferred comes from the condensing steam. For water, L=2.26×106 J/kgL=2.26\times10^6\ \mathrm{J/kg}L=2.26×106 J/kg.

What is the mass of steam that condenses? Use Q=mLQ=mLQ=mL and Q=PtQ=PtQ=Pt.

[1]
A

4.0×10−5 kg4.0\times10^{-5}\ \mathrm{kg}4.0×10−5 kg

B

4.0×10−2 kg4.0\times10^{-2}\ \mathrm{kg}4.0×10−2 kg

C

2.0×10−2 kg2.0\times10^{-2}\ \mathrm{kg}2.0×10−2 kg

D

25 kg25\ \mathrm{kg}25 kg

Markscheme

14.2 Specific heat capacity and latent heat Questions

  1. GCSE
  2. /Physics
  3. /14.2 Specific heat capacity and latent heat

110 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.

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