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4 marksKinetic Theory

CAPE Chemistry Unit 1 · 2008 · Paper 2 · Question 4(d)(i)

An organic compound, Y, contains carbon, hydrogen and oxygen only. When vapourised at 101 kPa and 373 K, 1.00 g of Y occupies a volume of 667 cm³. Calculate the mass in grams of 1 mole of Y. (Gas constant, R = 8.314 J K⁻¹ mol⁻¹).

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  1. 4(a)List THREE assumptions made about gas molecules in the kinetic theory.[3 marks]
  2. 4(b)(i)State the TWO conditions under which the ideal gas equation adequately describes the behaviour of gases.[2 marks]
  3. 4(b)(ii)Carefully explain the deviations produced by real gases.[3 marks]
  4. 4(c)Sketch a graph of volume (V) against the inverse of pressure (1/P) for a constant number of moles of an ideal gas at constant temperature.[1 mark]
  5. 4(d)(ii)On combustion in excess oxygen, 1 mole of Y produces carbon dioxide and water in the mole ratio 2:3. Deduce the formula of Y.[2 marks]

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