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2 marksFirst Law of Thermodynamics

CAPE Physics Unit 1 · 2009 · Paper 2 · Question 6(b)(ii)b)

Figure 4 shows pressure, volume, and temperature data for a fixed mass of gas with a molar heat capacity of (3/2)R at constant volume.

Using data from the graph, calculate the quantity of heat required to take the gas from C to B along CB.

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Other parts of this question

  1. 6(a)(i)Write down an equation for the First Law of Thermodynamics clearly explaining the meaning of the symbols used.[6 marks]
  2. 6(a)(ii)Explain why the heat capacity of a gas at constant pressure, Cp, is greater than the heat capacity of the gas at constant volume, Cv. Write down an expression…[6 marks]
  3. 6(b)(i)Using data from the graph, calculate the number of moles of gas.[3 marks]
  4. 6(b)(ii)a)Using data from the graph, calculate the quantity of heat required to take the gas from C to A along CA.[2 marks]
  5. 6(b)(iii)Using data from the graph, calculate the work done by the gas along the path from C to B.[2 marks]

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