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20-6

The best laboratory vacuum has a pressure of about 1.00 x 10^-18 atm, or 1.01 x 10^-13 Pa.
How many gas molecules are there per cubic centimeter in such a vacuum at 293 K? ...MORE

Subject: Physics   |   Topic: Heat, First Law of Thermodynamics  |   ID: 156840

 $ 1.0  

20-7

Oxygen gas having a volume of 1000 cm3 at 40.0 oC and 1.01*10^5 Pa expands until its volume is 1500 cm3 and its pressure is 1.06*10^5 Pa.
Find
(a) the number of moles of oxygen present and
(b) the final temperature of the sample ...MORE

Subject: Physics   |   Topic: Heat, First Law of Thermodynamics  |   ID: 156846

 $ 1.0  

20-8

An automobile tire has a volume of 1.64*10-2 m3 and contains air at a gauge pressure

(pressure above atmospheric pressure) 165 kPa when the temperature is 0.00 oC.
What is the gauge pressure of the air in the tires when its temperature rises to 27.0 oC and its volume increases to 1.67*10-2 m3?
Assume atmospheric pressure is 1.01*10^5 Pa. ...MORE

Subject: Physics   |   Topic: Heat, First Law of Thermodynamics  |   ID: 156847

 $ 1.0  

20-9

A quantity of ideal gas at 10.0°C and 100 kPa occupies a volume 2.50 m3.
(a) How many moles of the gas are present?
(b) If the pressure is now raised to 300 kPa and the temperature is raised to 30.0°C, how much volume does the gas occupy?
Assume no leaks.
...MORE

Subject: Physics   |   Topic: Heat, First Law of Thermodynamics  |   ID: 156848

 $ 1.0  

20-10

Calculate the work done by an external agent during an isothermal compression of 1.00 mol of oxygen from a volume of -22.4 L at 0°C and 1.00 atm pressure to 16.8 L. ...MORE

Subject: Physics   |   Topic: Heat, First Law of Thermodynamics  |   ID: 156849

 $ 1.0  

20-11

Pressure p , volume V, and temperature T for a certain material are related by eqv. fig 20-11, where A and В are constants.
Find an expression for the work done by the material if the temperature changes from T1 to T2 while the pressure remains constant.
...MORE

Subject: Physics   |   Topic: Heat, First Law of Thermodynamics  |   ID: 156851

 $ 1.0  

20-12

A container encloses two ideal gases. Two moles of the first gas are present, with molar mass M1. The second gas has molar mass M2 = 3M1 and 0.5 mol of this gas is present.
What fraction of the total pressure on the container wall is attributable to the second gas?

(The kinetic theory explanation of pressure leads to the experimentally, discovered law of partial pressures for a mixture of gases that do not react chemically: The total pressure exerted mixture is equal to the sum of the pressures that the several would exert separately if each were to occupy the vessel) ...MORE

Subject: Physics   |   Topic: Heat, First Law of Thermodynamics  |   ID: 156852

 $ 1.0  

20-13

Air that initially occupies 0.14 m3 at a gauge pressure of 103.0 kPa is expanded isothermally to a pressure of 101.3 kPa and then cooled at constant pressure until it reaches its initial volume.
Compute the work done by the air.
(Gauge pressure is the difference between the actual pressure and atmospheric pressure) . ...MORE

Subject: Physics   |   Topic: Heat, First Law of Thermodynamics  |   ID: 156853

 $ 2.0  

20-14

A sample of an ideal gas is taken through the cyclic process "abca" shown in Fig. ; at point a , T = 200 K.
(a) How many moles of gas are in the sample?
What are (b) the temperature of the gas at point b,
(c) the temperature of the gas at point c, and
(d) the net energy added to the gas as heat during the cycle? ...MORE

Subject: Physics   |   Topic: Heat, First Law of Thermodynamics  |   ID: 156855

 $ 2.0  

20-15

An air bubble of 20 cm^3 volume is at the bottom of a lake 40 m deep where the temperature is 4.0 oC. The bubble rises to the surface , which is at a temperature of 20 oC. Take the temperature of the bubble's air to be the same as that of the surrounding water.
Just as the bubble reaches the surface, what is its volume?

...MORE

Subject: Physics   |   Topic: Heat, First Law of Thermodynamics  |   ID: 156857

 $ 1.5  

20-17

Container A in Fig. holds an ideal gas at a pressure of 5.0 x 10^5 Pa and a temperature of 300 K. It is connected by a thin tube (and a closed valve) to container B, with four times the volume of A. Container В holds the same ideal gas at a pressure of 1.0*10^5 Pa and a temperature of 400 K. The valve is opened to allow the pressures to equalize, but the temperature of each container is kept constant at its initial value.
What then is the pressure in the two containers? ...MORE

Subject: Physics   |   Topic: Heat, First Law of Thermodynamics  |   ID: 156859

 $ 1.5  

20-19

The lowest possible temperature in outer space is 2.7 K.
What is the root-mean-square speed of hydrogen molecules at this temperature? ...MORE

Subject: Physics   |   Topic: Heat, First Law of Thermodynamics  |   ID: 156860

 $ 0  

20-20

Find the rms speed of argon atoms at 313 K. ...MORE

Subject: Physics   |   Topic: Heat, First Law of Thermodynamics  |   ID: 156861

 $ 0  

20-21

The temperature and pressure in the Sun's atmosphere are 2.00 x 10^6 К and 0.0300 Pa. Calculate the rms speed of free electrons
(mass = 9.11 x 10^(-31) kg) there, assuming they are an ideal gas. ...MORE

Subject: Physics   |   Topic: Heat, First Law of Thermodynamics  |   ID: 156862

 $ 1.0  

20-22

(a) Compute the root-mean-square speed of a nitrogen molecule at 20.0 oC. The molar mass of nitrogen molecules (N2) is M = 28.0 g/mol . At what temperatures will the root-mean-square speed be (b) half that value and (c) twice that value? ...MORE

Subject: Physics   |   Topic: Heat, First Law of Thermodynamics  |   ID: 156863

 $ 1.5  

20-23

A beam of hydrogen molecules (H2) is directed toward a wall, at an angle of 55 degree with the normal to the wall. Each molecule in the beam has a speed of 1.0 km/s and a mass of 3.3 x 10^(-24) g. The beam strikes the wall over an area of 2.0 cm^2, at the rate of I0^23 molecules per second.
What is the beam's pressure on the wall? ...MORE

Subject: Physics   |   Topic: Heat, First Law of Thermodynamics  |   ID: 156864

 $ 1.5  

20-24

At 273 К and 1.00 x 10^(-2) atm, the density of a gas is 1.24 x 10^(-5) g/cm^3.
(a) Find v_rms for the gas molecules,
(b) Find the molar mass of the gas and
(c) identify the gas.

...MORE

Subject: Physics   |   Topic: Heat, First Law of Thermodynamics  |   ID: 156865

 $ 1.5  

20-25

What is the average translational kinetic energy of nitrogen molecules at 1600 K? ...MORE

Subject: Physics   |   Topic: Heat, First Law of Thermodynamics  |   ID: 156866

 $ 1.0  

20-26

Determine the average value of the translational kinetic energy of the molecules of an ideal gas at
(a) 0.00 oC and
(b) 100 oC.

What is the translational kinetic energy per mole of an ideal gas at
(c) 0.00 oC and
(d) 100 oC?

...MORE

Subject: Physics   |   Topic: Heat, First Law of Thermodynamics  |   ID: 156867

 $ 1.5  

20-27

Water standing in the open at 32.0 grad_C evaporates because of the escape of some of the surface molecules. The heat of vaporiza¬tion 539 cal/g is approximately equal to Epsilon_n, where Epsilon is the average energy of the escaping molecules and n is the number of molecules per gram,
(a) Find Epsilon .
(b) What is the ratio of Epsilon to the average kinetic energy of H20 molecules, assuming the latter is related to temper¬ature in the same way as it is for gases? ...MORE

Subject: Physics   |   Topic: Heat, First Law of Thermodynamics  |   ID: 156868

 $ 1.0  
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