Question

What is the amount of heat (kJ) required to vaporize 1.75 kg of saturated liquid water at 55 C to saturated vapor while maintaining constant pressure? Select one: O a. required heat = 4189.1 kJ. b. required heat = 4168.5 kJ. c. required heat = 4147.2 kJ. d. required heat = 4126.0 kJ. e. required heat = 4104.5 kJ. Which of the following is correct regarding the zeroth law of thermodynamics? Select one: O a. it describes how a system changes its state by only focusing on the initial and final state without regard how the final state is achieved O b. it deals with all modes of thermodynamic equilibrium between bodies. O c. it is about thermal equilibrium among bodies. O d. it is concerned with energy conservation where essentially energy only changes its form. e. it describes how a system changes its state by allowing sufficient time for it to adjust to the new changes while maintain a state of balance.

Answer 1

GIVEN:

mass = 1.75 kg

temp of saturated liquid = $\small 55^{\circ}c$

TO FIND:

AMOUNT OF HEAT REQUIRED (Q)

SOLUTION;

1) Q = m * latent heat of vapourisation($\small \Delta {H_{v}}$)

from latent heat of vapourisation table

($\small \Delta {H_{v}}$) at $\small 55^{\circ}c$ = 2369.8 kJ/kg

therefore ,

Q = 1.75 * 2369.8

Q = 4147.2 KJ

2) The zeroth law of thermodynamics states that when two bodies are each in thermal equilibrium with some third body , then they are also in equilibrium with each other.

c)it is about thermal equilirium among bodies.

RESULT:

c) HEAT REQUIRED (Q) = 4147.2 KJ.

C) zeroth law of thermodynamics Is about thermal equilirium among bodies.