Question

If $400kJ$ work is done by the system and $150kJ$ heat is given to system then what will be affect on internal energy?

• A. Increases by $250kJ$
• B. Decreases by $250kJ$
• C. Decreases by $600kJ$
• D. Increases by $600kJ$

Answer 1

The correct option is B Decreases by $250kJ$

$△U=Q-W$ work done by the system is positive

$=150-400$

$=250KJ$ heat is given to the system is positive

$△U$ decreases by $250KJ$