Question

Pre-Medical : Physics
80. 5 moles of a gas expand from V to 2V at
400 K. Find work done by gas.
(1) 11.50 kJ
(2) 23.4 kJ
(3) 63.7 kJ
(4) 5.6 kJ
i2000​

Answer 1

Answer:

Work done by the gas during isothermal expansion is 11.5 kJ

Explanation:

Here gas is expanded from volume V to 2V

so here this process is isothermal process in which temperature of the gas remains constant

So we know that the formula to find the work done during isothermal process is given as

$W = nRTln(\frac{V_2}{V_1})$

now here it is given as

$V_2 = 2V$

$V_1 = V$

n = 5 moles

R = 8.31

T = 400 K

now we have

$W = (5)(8.31)(400)ln(\frac{2V}{V})$

$W = 11.5 KJ$

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Topic : Work done in isothermal process

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