At 1 atm, a liquid is heated above its normal boiling point.
- $\Delta$ S_univ for this process is

Question

At 1 atm, a liquid is heated above its normal boiling point. -$\Delta$S_univ for this process is

Quizplus · Accepted Answer

As the liquid is heated above its normal boiling point, it undergoes a phase change from liquid to gas. According to the First Law of Thermodynamics, the change in internal energy (ΔU) of a system is equal to the heat (q) added to the system minus the work (w) done by the system. In this case, the system is the liquid and the surroundings are the environment at 1 atm. As the liquid boils and turns into a gas, it expands and does work on the surroundings. Therefore, the work done by the system is positive (w > 0). Additionally, since heat is added to the system to cause the phase change, the heat added is also positive (q > 0). Therefore, ΔU = q - w > 0. This means that the internal energy of the system increases during the process and the change in internal energy is greater than zero. Thus, the answer is choice C.

At 1 Atm, a Liquid Is Heated Above Its Normal Δ\DeltaΔ

At 1 Atm, a Liquid Is Heated Above Its Normal $\Delta$