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Question

It is found that when a certain gas is heated, its volume increases by 50% and pressure decreases to 75% of its original value. If the original temperature of the gas was 15oC, find the temperature(in Celsius) to which of it was heated:

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Solution

Initial volume=V1, pressure=P1 and temperature=T1.
Final Volume=V2=150100=1.5V1 as volume increases by 50%.
Final Pressure=P2=0.75P1 as pressure decreases to 75% of its original pressure.
Original temperature=T1=-15C=258 K
Now, PVT=nR= constant for a particular gas having 1 mole.
P1V1T1=P2V2T2
P1V1258=0.75P1×1.5V1T2T2=290.25 K=17.25C


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