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JAMB Physics 2001 Question 16

Question 16

Gas Laws

The pressure of a given mass of a gas changes from 300 N m−2 to 120 N m−2 while the temperature drops from 127 °C to −73 °C. The ratio of the final volume to the initial volume is

  1. A.2 : 5
  2. B.5 : 4
  3. C.5 : 2
  4. D.4 : 5
Show the answer and explanation

Answer: B (5 : 4)

Explanation

P1V1/T1 = P2V2/T2 with T1 = 400 K, T2 = 200 K: V2/V1 = (300 × 200)/(120 × 400) = 5/4.