First slide

Thermometry

Question

One litre of He gas at a pressure of 76cm of Hg and temperature 27⁰C is heated till its pressure and volume are doubled. The final temperature attained by the gas is

Easy

A

900⁰C
B

927⁰C
C

627⁰C
D

327⁰C

Solution

PV = nRT
$\large \frac {T_2}{T_1}=\frac {P_2}{P_1}\frac {V_2}{V_1}=\frac {2P}{P}\frac {2V}{V}=4$
T₂ = 4 x 300 = 1200k = 927⁰C

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