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A flask containing air (open to the atmosphere) is heated from 300K to 500K. Then % of air escaped to the atmosphere is

Correct answer

40

Step-by-step solution

P 1 V 1 = n 1 R T 1 P 1 V 1 = n 2 R T 2 So n 1 R T 1 = n 2 R T 2 (P of V are constant) n 1 T 1 = n 2 T 2 , n 1 300 = n 2 500 n 2 = 3 5 n 1 No. of moles escaped = n 1 - 3 5 n 1 = 2 5 n 1 % escaped = 2 5 × 100 = 40 %

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