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JAMB Chemistry 1998 Question 6

Question 6

Mole Concept and Stoichiometry

A given amount of gas occupies 10.0 dm3 at 4 atm, and 273°C. The number of moles of the gas present is [Molar volume of a gas at s.t.p. = 22.4 dm3]

  1. A.0.89 mol
  2. B.1.90 mol
  3. C.3.80 mol
  4. D.5.70 mol
Show the answer and explanation

Answer: A (0.89 mol)

Explanation

Convert to s.t.p.: V = 10.0 × 4 × 273/546 = 20 dm3. Moles = 20/22.4 ≈ 0.89 mol.