HARDMCQ SINGLEJEE Mains ChemistryPhysical ChemistryGaseous stateAchiever Section

A flask containing air (open to atmosphere) is heated from 300 K to 500 K. The percentage of air escaped to the atmosphere is nearly

A.16.6

B.40✓ Correct

C.60

D.20.

Explanation

Open to atmosphere constant pressure and volume is constant (Assumed as not mentioned.) PV = nRT nT = const >> 1 1 2 2 n T = n T 1 1 n = 100, T = 300K 2 2 n = , T = 500K x 100 300 = 500 x x x = 60 x % escaped = 100 – 60 = 40 %

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