Question

A gas expands against a variable pressure given by P= 20/V
(where P in atm and V in L). During expansion from volume
of 1 L to 10 L, the gas undergoes a change in internal energy
of 400 J. How much heat is absorbed by the gas during
expansion ?
(1) 4260 J
(2) 5065.8 J
(3) 4660 J
(4) 46 J
​

Answer 1

Answer:

Chemistry

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A gas expands against a variable pressure given by p=

V

20

During expansion from volume of 1 litre to 1 litre, the gas undergoes a change in internal energy of 400 J. How much heat is absorbed by the gas during expansion?

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Answer

Correct option is

C

5065.8 J

ΔU=W+Q

W=∫Pdv

=−∫

V

20

dv=−20ln

V

1

V

2

=−20×ln(10)atmL

∴Q=400+20×101.3

≃5066.8

Answer 2

Explanation:

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