A gas at pressure P N/m² and temperature 27°C is heated to 77°C at constant volume. The new pressure is

Jamb 1978

A gas at pressure P N/m² and temperature 27°C is heated to 77°C at constant volume. The new pressure is

A. 0.85P N/m²

B. 0.86P N/m²

C. 1.16P N/m²

D. 1.18P N/m²

E. 2.85P N/m²

ANSWER: Option  C

EXPLANATION: You remember Gas laws, right? The law that holds for this question is Gay Lussac’s Law which states that the pressure of a given amount of gas held at constant volume is directly proportional to the absolute temperature.

To solve that question, apply Gay Lussac equation;

P1/T1 = P2/T2

Absolute temperature!!! Always remember to convert your temperature into Kelvin!

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