First slide

First law of thermo dynamics

Question

One mole of an ideal gas at 300 K is expanded isothermally reversibly from an initial volume of 1 litre to 10 liters. The ΔE for this process is (R=2 cal mol^–1 K^–1)

Easy

A

163.7 cal
B

Zero
C

1381.1 cal
D

9 lit atm

Solution

$W = -2.303 nRT\; log\large \frac{{{V_f}}}{{{V_i}}}$
ΔE = q+w
Isotherimal process ΔE = 0

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