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Question

A gas in an open container is heated from 270C TO 1270C. What will be the ratio of the gas left in the container to the original amount of gas?


A

3/4

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B

1/4

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C

1/2

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D

1/8

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Solution

The correct option is A

3/4


On heating a gas in a open container (P constt , V constt) , moles of gas go out.

Thus n1T1 = n2T2

Or n1 × 300 = n2 × 400

n2 = 3n14

Fraction of moles of gas left

= n2n1 = 3n14n1 = 34


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