Two containers of equal volume contain the same gas at the pressure P 1 and P 2 and absolute temperature T 1 and T 2 respectively. On joining the vessels, the gas reaches a common pressure P and a common temperature T . The ratio PT is equal to
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a
P 1T 2+P 2T 1T 1T 2
b
P 1T 2+P 2T 1T 1+T 2
c
12[P 1T 2+P 2T 1T 1T 2]
d
[P 1T 2−P 2T 1T 1T 2]
answer is C.
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Detailed Solution
For a closed system, the total number of moles remains constant. So P 1V=n 1RT 1 and P 2V=n 2RT 2 ∴ P(2V)=(n 1+n 2)RT ∴ PT=(n 1+n 2)2VR=12[P 1T 1+P 2T 2] =12[P 1T 2+P 2T 1T 1T 2]