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9 marksThe Kinetic Theory of Gases

CAPE Physics Unit 1 · 2002 · Paper 2 · Question 8(b)(iii)a)

Helium gas is contained in the vessel. The gas occupies a volume of 1.0 x 10⁻³ m³ at a pressure of 1.0 x 10⁵ Pa and temperature of 25°C.

Calculate the number of moles of helium atoms in the container.

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Other parts of this question

  1. 8(a)(i)Name the process by which heat is supplied to the gas at C via the copper rod at B.[8 marks]
  2. 8(a)(ii)Use the kinetic theory to explain why the piston at D eventually pushes on the switch at E.[8 marks]
  3. 8(a)(iii)Why must the copper rod be lagged and the piston light and frictionless?[8 marks]
  4. 8(b)(i)Calculate an estimate for the change of internal energy of the gas at C.[9 marks]
  5. 8(b)(ii)Why is the actual value for the change of internal energy of the gas at C lower than the value you calculated in (b)(i) above.[9 marks]
  6. 8(b)(iii)b)Calculate the total kinetic energy of the helium atoms.[9 marks]
  7. 8(c)Explain what happens to the piston at D and why.[3 marks]

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