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3 marksFirst Law of Thermodynamics

CAPE Physics Unit 1 · 2018 · Paper 2 · Question 6(e)

Rather than compressing the gas as in (b), the same mass of the same gas is heated in the same cylinder at constant volume, starting with the same initial conditions. The heat supplied is 85 joules and the final temperature is 795 K.

Determine its molar heat capacity, C_v.

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Other parts of this question

  1. 6(a)Use the equation of state for an ideal gas to determine the number of moles of gas in the cylinder.[3 marks]
  2. 6(b)(i)Explain this rise in temperature on a macroscopic scale, using the first law of thermodynamics.[3 marks]
  3. 6(b)(ii)Explain this rise in temperature on a microscopic scale, using the kinetic theory of gases.[3 marks]
  4. 6(c)Calculate the pressure of the gas after the compression in (b).[2 marks]
  5. 6(d)The work done on the gas during the compression is 85 J. Use the first law of thermodynamics to determine the INCREASE in the thermal energy of the gas during…[1 mark]

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