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JAMB Physics 1978 Question 20

Question 20

Gas Laws

A gas at pressure P N m−2 and temperature 27°C is heated to 77°C at constant volume. The new pressure is

  1. A.0.85P N m−2
  2. B.0.86P N m−2
  3. C.1.16P N m−2
  4. D.1.18P N m−2
  5. E.2.85P N m−2.
Show the answer and explanation

Answer: C (1.16P N m−2)

Explanation

At constant volume p/T is constant, with T in kelvin: p₂ = P × 350/300 ≈ 1.17P, closest to 1.16P.