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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