Answer to Question #156600 in General Chemistry for Jon jay mendoza

Question

1. Calculate ΔU if 100 kJ of heat energy is absorbed by the system and 30 kJ of work is done on the surroundings.

Answer 1

As given that work is done on the surroundings and heat is absorbed by the system.

Therefore,

q = 100kJ

w = −30kJ

Now, from first law of thermodynamics,

ΔU = q + w

⇒ ΔU = 100 + (−30) = 70kJ

Hence, ΔU is 70kJ