Q.

At 27°C one mole of an ideal gas is compressed isothermally and reversibly from a pressure of 2 atm to 10 atm. The values of ΔE and q are (R = 2 cal)

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a

0, -965.84 cal

b

-965.84 cal, -865.58 cal

c

865.58 cal, -865.58 cal

d

965.84 cal, +865.58 cal

answer is A.

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Detailed Solution

Isothermally and reversibly work doneW=2.303nRTlogp2/p1=2.303×1×2×300log(10/2)=2.303×600×log5=965.84 At constant temperature, ΔE=0ΔE=q+Wq=-W=-965.84cal
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At 27°C one mole of an ideal gas is compressed isothermally and reversibly from a pressure of 2 atm to 10 atm. The values of ΔE and q are (R = 2 cal)