Question

Under which of the following conditions is the relation,
$\Delta H=\Delta U+P\Delta V$ valid for closed system?

• A. Constant pressure
• B. Constant temperature
• C. Constant temperature and pressure
• D. Constant temperature, pressure and composition

Answer 1

The correct option is C Constant temperature and pressure

$H=C+PV△H=△C+P△V+V△P$

If $△P=0$, i.e. pressure is constant

$△H=△C+P△V$

Hence, the above relation is valid at constant pressure and temperature.