Related Problems with Solutions
5 : A chemical reaction releases 150 kJ of heat and does 100 kJ of work. Calculate the change in internal energy (∆U) for the reaction.
Solution :
The change in internal energy (∆U) is related to the heat (q) and work (W) done on or by the system by the first law of thermodynamics:
∆U = q - W
Given that the reaction releases 150 kJ of heat (q) and does 100 kJ of work (W), we can calculate ∆U:
∆U = 150 kJ - 100 kJ = 50 kJ
So, the change in internal energy (∆U) for the reaction is 50 kJ.
