An open vessel is heated from 27o to 227oC. The percentage of air expelled out is:
A
20
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B
30
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C
40
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D
50
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Solution
The correct option is B 40 According to ideal gas equation: n1T1=n2T2 (V,P are constant) n1×300=n2×500 n2=3n15 ∴ Mole given out =25n1 % =25n1×100n1=40 %