# CHAPTER 25 IDEAL GAS LAWS

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1 EXERCISE 139, Page 303 CHAPTER 5 IDEAL GAS LAWS 1. The pressure of a mass of gas is increased from 150 kpa to 750 kpa at constant temperature. Determine the final volume of the gas, if its initial volume is 1.5 m 3. Since the change occurs at constant temperature (i.e. an isothermal change), Boyle's law applies, i.e. p 1 V 1 = p V where p 1 = 150 kpa, p = 750 kpa and V 1 = 1.5 m 3 Hence, (150)(1.5) = (750)V from which, volume V = = 0.3 m 3. In an isothermal process, a mass of gas has its volume reduced from 50 cm 3 to 3 cm 3. If the initial pressure of the gas is 80 kpa, determine its final pressure. Since the change occurs at constant temperature (i.e. an isothermal change), Boyle's law applies, i.e. p 1 V 1 = p V where p 1 = 80 kpa, V 1 = 50 cm 3 and V = 3 cm 3 Hence, (80)(50) = (p )(3) from which, pressure p = = 15 kpa 3. The piston of an air compressor compresses air to 1 of its original volume during its stroke. 4 Determine the final pressure of the air if the original pressure is 100 kpa, assuming an isothermal change. Since the change occurs at constant temperature (i.e. an isothermal change), Boyle's law applies, 30

2 i.e. p 1 V 1 = p V where p 1 = 100 kpa, V = 1 4 V 1 Hence, (100)( V 1 ) = (p )( 1 4 V ) V1 100 from which, pressure p = = 400 kpa 1 1 V A quantity of gas in a cylinder occupies a volume of m 3 at a pressure of 300 kpa. A piston slides in the cylinder and compresses the gas, according to Boyle's law, until the volume is 0.5 m 3. If the area of the piston is 0.0 m, calculate the force on the piston when the gas is compressed. An isothermal process means constant temperature and thus Boyle's law applies, i.e. p 1 V 1 = p V where V 1 = m 3, V = 0.5 m 3 and p 1 = 300 kpa. Hence, (300)() = p (0.5) from which, pressure, p = = 100 kpa Pressure = force, from which, force = pressure area. area Hence, force on the piston = ( Pa)(0.0 m ) = 4000 N = 4 kn 5. The gas in a simple pump has a pressure of 400 mm of mercury (Hg) and a volume of 10 ml. If the pump is compressed to a volume of ml, calculate the pressure of the gas, assuming that its temperature does not change? Since PV 1 1 PV then (400 mm Hg)(10 ml) = ( P )( ml) from which, new pressure, P = 400 mm Hg10 ml ml = 000 mm of mercury 31

3 EXERCISE 140, Page Some gas initially at 16C is heated to 96C at constant pressure. If the initial volume of the gas is 0.8 m 3, determine the final volume of the gas. Since the change occurs at constant pressure (i.e. an isobaric process), Charles law applies, V1 V i.e. where V 1 = 0.8 m 3, T 1 = 16C = ( )K = 89 K and T = ( )K = 369 K. 0.8 V Hence, from which, volume at 96C, V = (0.8)(369) 89 = 1.0 m 3. A gas is contained in a vessel of volume 0.0 m 3 at a pressure of 300 kpa and a temperature of 15C. The gas is passed into a vessel of volume m 3. Determine to what temperature the gas must be cooled for the pressure to remain the same. Since the process is isobaric it takes place at constant pressure and hence Charles law applies, V1 V i.e. where T 1 = ( )K = 88 K and V 1 = 0.0 m 3 and V = m 3 Hence T from which, final temperature, T = (0.015)(88) 0.0 = 16 K or (16-73)C i.e. - 57C 3. In an isobaric process gas at a temperature of 10C has its volume reduced by a sixth. Determine the final temperature of the gas. Since the process is isobaric it takes place at constant pressure and hence Charles law applies, 3

4 V1 V i.e. where T 1 = ( )K = 393 K and V = 5 6 V 1 Hence from which, final temperature, T = 5 V V T 5 V = 37.5 K V 6 1 = ( )C = 54.5C 4. The volume of a balloon is 30 litres at a temperature of 7ºC. If the balloon is under a constant internal pressure, calculate its volume at a temperature of 1ºC. V1 V Since where T 1 = (7 + 73)K = 300 K and T = (1 + 73)K = 85 K 30litres V Hence, 300 K 85K and new volume, V = 30litres 85K = 8.5 litres 300 K 33

5 EXERCISE 141, Page Gas, initially at a temperature of 7C and pressure 100 kpa, is heated at constant volume until its temperature is 150C. Assuming no loss of gas, determine the final pressure of the gas. p1 p Since the gas is at constant volume, the pressure law applies, i.e. where T 1 = (7 + 73)K = 300 K, T = ( )K = 43 K and p 1 = 100 kpa 100 p Hence, from which, final pressure, p = (100)(43) 300 = 141 kpa. A pressure vessel is subjected to a gas pressure of 8 atmospheres at a temperature of 15ºC. The vessel can withstand a maximum pressure of 8 atmospheres. Calculate the gas temperature increase the vessel can withstand. P1 P Since where T 1 = ( )K = 88 K Hence, 8atmospheres 8atmospheres 88K T from which, new temperature, T = 8atmospheres 88K 8atmospheres = 1008 K or ( )ºC = 735ºC Hence, temperature rise = ( )K = 70 K or temperature rise = (735 15)ºC = 70ºC Note that a temperature change of 70 K = a temperature change of 70ºC 34

6 EXERCISE 14, Page A gas A in a container exerts a pressure of 10 kpa at a temperature of 0C. Gas B is added to the container and the pressure increases to 300 kpa at the same temperature. Determine the pressure that gas B alone exerts at the same temperature. Initial pressure, p A = 10 kpa, and the pressure of gases A and B together, p = p A + p B = 300 kpa By Dalton's law of partial pressure, the pressure of gas B alone is p B = p - p A = = 180 kpa 35

7 EXERCISE 143, Page A gas occupies a volume of 1.0 m 3 when at a pressure of 10 kpa and a temperature of 90C. Determine the volume of the gas at 0C if the pressure is increased to 30 kpa. 1 1 Using the combined gas law: where V 1 = 1.0 m 3, p 1 = 10 kpa, p = 30 kpa, T 1 = ( )K = 363 K and (10)(1.0) (30) V T = (0 + 73)K = 93 K, gives: from which, volume at 0C, V = (10)(1.0)(93) (363)(30) = m 3. A given mass of air occupies a volume of 0.5 m 3 at a pressure of 500 kpa and a temperature of 0C. Find the volume of the air at STP. 1 1 Using the combined gas law: where V 1 = 0.5 m 3, p 1 = 500 kpa, T 1 = (0 + 73)K = 93 K, p = kpa, and (500)(0.5) (101.35) V T = 0C = 73 K, gives: from which, volume at STP, V = (500)(0.5)(73) (93)(101.35) =.30 m 3 3. A balloon is under an internal pressure of 110 kpa with a volume of 16 litres at a temperature of ºC. If the balloon s internal pressure decreases to 50 kpa, what will be its volume if the temperature also decreases to 1ºC. 36

8 1 1 Using the combined gas law: where V 1 = 16 litres, p 1 = 110 kpa, p = 50 kpa, T 1 = ( + 73)K = 95 K and (110)(16) (50) V T = (1 + 73)K = 85 K, gives: from which, volume at 1C, V = (110)(16)(85) (95)(50) = 34.0 litres 4. A spherical vessel has a diameter of.0 m and contains hydrogen at a pressure of 300 kpa and a temperature of - 30C. Determine the mass of hydrogen in the vessel. Assume the characteristic gas constant R for hydrogen is 4160 J/(kg K). From the characteristic gas equation, = mrt where p = 300 kpa, V = = m 3, T = ( )K = 43 K, and R = 4160 J/(kg K). Hence ( )(4.1888) = m(4160)(43) from which, mass of air, m = 3 (30010 )(4.1888) (4160)(43) = 1.4 kg 5. A cylinder 00 mm in diameter and 1.5 m long contains oxygen at a pressure of MPa and a temperature of 0C. Determine the mass of oxygen in the cylinder. Assume the characteristic gas constant for oxygen is 60 J/(kg K). From the characteristic gas equation, = mrt where p = MPa, V = 0.1 (1.5) = m 3, T = (0 + 73)K = 93 K, and R = 60 J/(kg K). Hence ( 10 6 )(0.0471) = m(60)(93) 37

9 from which, mass of air, m = 6 (10 )(0.0471) (60)(93) = 1.4 kg 6. A gas is pumped into an empty cylinder of volume 0.1 m 3 until the pressure is 5 MPa. The temperature of the gas is 40C. If the cylinder mass increases by 5.3 kg when the gas has been added, determine the value of the characteristic gas constant. From the characteristic gas equation, = mrt from which, R = mt where p = Pa, V = 0.1 m 3, T = ( )K = 313 K and m = 5.3 kg Hence, the characteristic gas constant, R = mt = 300 J/(kg K) 7. The mass of a gas is 1. kg and it occupies a volume of m 3 at STP. Determine its characteristic gas constant. From the characteristic gas equation, = mrt from which, R = mt where m = 1. kg, V = m 3, p = kpa,, T = 0C = 73 K Hence, the characteristic gas constant, R = mt = 4160 J/(kg K) cm 3 of air initially at a pressure of 500 kpa and temperature 150C is expanded to a volume of 100 cm 3 at a pressure of 00 kpa. Determine the final temperature of the air, assuming no losses during the process. 38

10 1 1 Using the combined gas law: where V 1 = 30 cm 3, V = 100 cm 3, p 1 = 500 kpa, p = 00 kpa, and T 1 = ( )K = 43 K, gives: (500)(30) (00)(100) 43 T from which, final temperature, T = (00)(100)(43) (500)(30) = 564 K or (564 73)C = 91C 9. A quantity of gas in a cylinder occupies a volume of 0.05 m 3 at a pressure of 400 kpa and a temperature of 7C. It is compressed according to Boyle's law until its pressure is 1 MPa, and then expanded according to Charles' law until its volume is 0.03 m 3. Determine the final temperature of the gas. 1 1 Using the combined gas law: where V 1 = 0.05 m 3, V = 0.03 m 3, p 1 = 400 kpa, p = 1 MPa = 1000 kpa, and T 1 = (7 + 73)K = 300 K, gives: (0.05)(400) (0.03)(1000) 300 T from which, final temperature, T = (0.03)(1000)(300) (0.05)(400) = 450 K or 177C 10. Some air at a temperature of 35C and pressure bar occupies a volume of 0.08 m 3. Determine the mass of the air assuming the characteristic gas constant for air to be 87 J/(kg K). (1 bar = 10 5 Pa) From the characteristic gas equation, = mrt where T = ( )K = 308 K, p = bar = 5 Hence ( 10 )(0.08) = m(87)(308) 5 10 Pa, V = 0.08 m 3 and R = 87 J/(kg K). 39

11 from which, mass of air, m = 5 (10 )(0.08) (87)(308) = kg 11. Determine the characteristic gas constant R of a gas that has a specific volume of 0.67 m 3 /kg at a temperature of 17C and pressure 00 kpa. From the characteristic gas equation, = mrt from which, R = mt where p = Pa, T = ( )K = 90 K and specific volume, V/m = 0.67 m 3 /kg. 3 p V 0010 T m 90 Hence the characteristic gas constant, R = 0.67 = 184 J/(kg K) 330

12 EXERCISE 144, Page A vessel P contains gas at a pressure of 800 kpa at a temperature of 5C. It is connected via a valve to vessel Q that is filled with similar gas at a pressure of 1.5 MPa and a temperature of 5C. The volume of vessel P is 1.5 m 3 and that of vessel Q is.5 m 3. Determine the final pressure at 5C when the valve is opened and the gases are allowed to mix. Assume R for the gas to be 97 J/(kg K). For vessel P: p P = Pa, T P = (5 + 73)K = 98 K, V P = 1.5 m 3 and R = 97 J/(kg K) From the characteristic gas equation, p P V P = m P RT P Hence ( )(1.5) = m P (97)(98) from which, mass of gas in vessel P, m P = For vessel Q: 3 (80010 )(1.5) (97)(98) = kg p Q = Pa, T Q = (5 + 73)K = 98 K, V Q =.5 m 3 and R = 97 J/(kg K) From the characteristic gas equation, p Q V Q = m Q RT Q Hence ( )(.5) = m Q (97)(98) from which, mass of gas in vessel Q, m Q = 6 (1.510 )(.5) (97)(98) = kg When the valve is opened, mass of mixture, m = m P + m Q = = kg. Total volume, V = V P + V Q = = 4.0 m 3, R = 97 J/(kg K), T = 98 K. From the characteristic gas equation, = mrt p(4.0) = (55.98)(97)(98) 331

13 from which, final pressure, p = (55.98)(97)(98) 4.0 = 1.4 MPa. A vessel contains 4 kg of air at a pressure of 600 kpa and a temperature of 40C. The vessel is connected to another by a short pipe and the air exhausts into it. The final pressure in both vessels is 50 kpa and the temperature in both is 15C. If the pressure in the second vessel before the air entered was zero, determine the volume of each vessel. Assume R for air is 87 J/(kg K). For vessel 1: m 1 = 4 kg, p 1 = Pa, T 1 = ( )K = 313 K and R = 87 J/(kg K) From the characteristic gas equation, p 1 V 1 = m 1 RT 1 Hence ( ) V 1 = (4)(87)(313) (4)(87)(313) from which, volume of vessel 1, V 1 = 3 (60010 ) From the characteristic gas equation, = mrt ( ) V Total = (4)(87)( ) = 0.60 m 3 (4)(87)(88) from which, total volume, V Total = = 1.3 m 3 Hence, volume of vessel, V = = 0.7 m 3 3. A vessel has a volume of 0.75 m 3 and contains a mixture of air and carbon dioxide at a pressure of 00 kpa and a temperature of 7C. If the mass of air present is 0.5 kg determine (a) the partial pressure of each gas, and (b) the mass of carbon dioxide. Assume the characteristic gas constant for air to be 87 J/(kg K) and for carbon dioxide 184 J/(kg K). (a) V = 0.75 m 3, p = 00 kpa, T = (7 + 73)K = 300 K, m air = 0.50 kg, R air = 87 J/(kg K). 33

14 If p air is the partial pressure of the air, then using the characteristic gas equation, p air V = m air R air T gives: (p air )(0.75) = (0.50)(87)(300) from which, the partial pressure of the air, p air = (0.50)(87)(300) (0.75) = 57.4 kpa By Dalton's law of partial pressure the total pressure p is given by the sum of the partial pressures, i.e. p = p air + p CO, from which, the partial pressure of the carbon dioxide, p CO (b) From the characteristic gas equation, p V = m CO = p - p air = = 14.6 kpa R CO CO Hence, ( )(0.75) = m (184)(300) CO T from which, mass of hydrogen, m ( )(0.75) (184)(300) 3 = CO = 1.94 kg 4. A mass of gas occupies a volume of 0.0 m 3 when its pressure is 150 kpa and its temperature is 17C. If the gas is compressed until its pressure is 500 kpa and its temperature is 57C, determine (a) the volume it will occupy and (b) its mass, if the characteristic gas constant for the gas is 05 J/(kg K). 1 1 (a) Using the combined gas law: where V 1 = 0.0 m 3, p 1 = 150 kpa, T 1 = ( )K = 90 K, p = 500 kpa, and (150)(0.0) (500) V T = ( )K = 330 K, gives: from which, volume at STP, V = (150)(0.0)(330) (90)(500) = m 3 (b) From the characteristic gas equation, = mrt where T = 90 K, p = 150 kpa, V = 0.0 m 3 and R = 05 J/(kg K). 333

15 Hence (150000)(0.0) = m(05)(90) from which, mass of air, m = (150000)(0.0) (05)(90) = kg 5. A compressed air cylinder has a volume of 0.6 m 3 and contains air at a pressure of 1. MPa absolute and a temperature of 37C. After use the pressure is 800 kpa absolute and the temperature is 17C. Calculate (a) the mass of air removed from the cylinder, and (b) the volume the mass of air removed would occupy at STP conditions. Take R for air as 87 J/(kg K) and atmospheric pressure as 100 kpa. (a) From the characteristic gas equation, p 1 V 1 = mrt 1 from which, mass of air, m = 6 p1v 1 (1.10 )(0.6) R T (87)(37 73) 1 = kg Also, p V = mrt from which, mass of air, m = 3 pv (80010 )(0.6) R T (87)(17 73) = kg Hence, the mass of air removed from the cylinder = =.33 kg (b) From the characteristic gas equation, = mrt where p = 100 kpa, m =.33 kg, R = 87 J/(kg K) and T = (0 + 73)K = 73 K Hence, (100000)(V) = (.33)(87)(73) from which, the volume the mass of air removed would occupy at STP conditions, V = = 1.83 m 3 334

16 EXERCISE 145, Page 310 Answers found from within the text of the chapter, pages 301 to 310. EXERCISE 146, Page (a). (d) 3. (b) 4. (b) 5. (c) 6. (d) 7. (b) 8. (c) 9. (c) 10. (b) 335

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