Question

At ${27}^{o}C$ 1 mole of an ideal gas expand in reversible and isothermally from 2 atm to 1 atm then $\Delta H$ will be:

• A. $1.73KJ$
• B. Zero
• C. $-1.73KJ$
• D. $3.46KJ$

Answer 1

Answer: (B)

Zero

Solution:- (B) $0$

In an isothermal expansion, the temperature remains constant.

$\therefore \Delta H=0$