A 1.00-mol sample of a monoatomic ideal gas is taken through the cycle shown in the figure. At point A, the pressure, volume, and temperature are , , and , respectively. In terms of R and , find

(a) the total energy entering the system by heat per cycle

(b) the total energy leaving the system by heat per cycle

(c) the efficiency of an engine operating in this cycle

(d) Explain how the efficiency compares with that of an engine operating in a Carnot cycle between the same temperature extremes.

answer

watching

360

views

For unlimited access to Homework Help, a Homework+ subscription is required.

You have 0 free answers left.
Get unlimited access to 3.8 million step-by-step answers.

Get unlimited access

Already have an account? Log in

John Edward CayasLv10

11 Nov 2020

Unlock all answers

Get 1 free homework help answer.

Already have an account? Log in

Join us on Discord

Chemistry Study Group

Join now

Related questions

A heat engine takes 1.00-mol sample of an ideal monatomic gas through the cycle shown in Figure. The process A to B is an isothermal expansion. Calculate

a. the net work done by the gas,
b. the energy added to the gas by heat,
c. the energy exhausted from the gas by heat, and

d. the thermal efficiency of the heat engine.

About 86% of the world’s electrical energy is produced by using steam turbines, a form of heat engine. In his analysis of an ideal heat engine, Sadi Carnot concluded that the maximum possible efficiency is defined by the total work that could be done by the engine, divided by the quantity of heat available to do the work (for example, from hot steam produced
by combustion of a fuel such as coal or methane). This efficiency is given by the ratio (T_high – T_low)/T_high, where T_high is the temperature of the heat going into the engine and T_low is that of the heat leaving the engine. (a) What is the maximum possible efficiency of a heat engine operating between an input temperature of 700 K and an exit temperature of 288 K? (b) Why is it important that electrical power plants be located near bodies of relatively cool water? (c) Under what conditions could a heat engine operate at or near 100% efficiency? (d) It is often said that if the energy of combustion of a fuel such as methane were captured in an electrical fuel cell instead of by burning the fuel in a heat engine, a greater fraction of the energy could be put to useful work. Make a qualitative drawing like that in Figure 5.10 (p. 175) that illustrates the fact that in principle the fuel cell route will produce more useful work than the heat engine route from combustion of methane

b) It is important because naturally cold water provides lower exit temperature, and lower is the exit temperature (T_min) the more efficient is the steam engine.

c) If T_min = 0 (an exit temperature is the absolute zero), the process would be 100% efficient. The closer is the exit temperature to 0 K, the more efficient is the process.

sangriaporcupine244