Calculate the change in internal energy when 2.50 kJ of energy is transferred as heat to 1.50 mol N₂ at 298 K and 1 atm at constant volume. A) -2.50 kJ B) +2.50 kJ C) +1.00 kJ D) -1.50 kJ E) +1.50 kJ

Question

Quizplus · Accepted Answer

Since the process is at constant volume, the change in internal energy can be calculated by using the following equation:
ΔU = qV
where q is the heat transferred and V is the volume (constant in this case).
Substitute the values:
ΔU = (2.50 kJ) / (1.50 mol) = 1.67 kJ/mol
The answer should be reported with the correct sign, indicating whether energy is being gained or lost by the system. In this case, since energy is transferred as heat to the system, ΔU is positive, so the answer is +1.67 kJ/mol or +2.50 kJ (approximately). Choice B is the closest answer.

Calculate the Change in Internal Energy When 2