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