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14.2 Specific heat capacity and latent heat

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Question 9

A condenser changes ethanol vapour into liquid while the ethanol remains at its boiling point. Energy is removed from the ethanol at a steady rate of 420 W. After operating for 200 s, the condenser has collected 0.10 kg of liquid ethanol. All the energy removed from the ethanol causes this change of state.

What is the specific latent heat of vaporisation of ethanol? Use E=PtE=PtE=Pt and E=mLE=mLE=mL.

[1]
A

8.4×105 J/kg8.4\times10^5\ \mathrm{J/kg}8.4×105 J/kg

B

8.4×104 J/kg8.4\times10^4\ \mathrm{J/kg}8.4×104 J/kg

C

8.4×103 J/kg8.4\times10^3\ \mathrm{J/kg}8.4×103 J/kg

D

4.2×103 J/kg4.2\times10^3\ \mathrm{J/kg}4.2×103 J/kg

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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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