Question

What will be the change in internal energy when $12$ $kJ$ of work is done on the system and $2kJ$ of heat is given by the system?

• A. $+10$ $kJ$
• B. $-10$ $kJ$
• C. $+5$ $kJ$
• D. $-5$ $kJ$

Answer 1

The correct option is A $+10$ $kJ$

Heat evolved $=-2kJ$

Work done on the system $=+12kJ$

$\Delta U$$=q+w$

$=-2+12$

$=+10kJ$

Hence, option $A$ is correct.