Answer to Question #210600 in General Chemistry for edge

Question

A gas absorbs 32.5 KJ of heat when 18.2 kJ of work was done on it.

Answer 1

If energy is absorbed by the system then :q=+ve

If energy is lost by the system then :q=-ve

If work is done on the system :q=+ve(compression)

If work is done by the system :w=-ve

According to the first law of thermodynamics :

$\Delta U=q+w$

q=+32.5kJ

w=+18.2kJ

$\therefore\Delta U=32.5kJ+18.2kJ =50.7kJ$

$\Delta U=50.7kJ$