Thermodynamics: An Engineering Approach
9th Edition
ISBN: 9781260048766
Author: CENGEL
Publisher: MCG
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Chapter 15.7, Problem 43P
To determine
Does the enthalpy of formation of a substance change with temperature.
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. A mixture of CO2 and water vapor is at 100 kPa, 200°C. As the mixture is cooled at a constant
pressure, water vapor begins to condense when the temperature reaches 70°C. Determine (a) the
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Model: Ideal Gas Properties of Nitrogen (N2)" for the value of molar specific enthalpy at
temperature of 277.778 K.
T
270 K
277.778 K
280 K
h
-820 kJ/kmol
h
-528 kJ/kmol
The molar specific enthalpy of nitrogen at 277.778 K is -592.88 kJ/kmol.
DON'T USE CHATGPT, HANDWRITTEN ONLY.
The heat of combustion of H2(g) to form H2O(l) under constant-pressure conditions is -285.83 kJ/mol at 25°C. If the water is formed at 1 bar and has a density of 1000 kg/m³, calculate the change in internal energy for this reactionA. -187 kJ/molB. -210 kJ/molC. -282 kJ/molD. -310 kJ/mol
2 %0 l. Ii. .
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1- Calculate the dryness fraction (quality) of steam which has 1.5
kg of water in suspension with 50 kg of steam.
2-A vessel having a volume of 0.6 m3 contains 3.0 kg of liquid
water and water vapour mixture in equilibrium at a pressure of 0.5
MPa. Calculate
(1) Mass and volume of liquid ;
(2) Mass and volume of vapour
3-Determine the missing properties and the phase descriptions in
the following table for water:
T, °C
Р, КРа
u, kJ/kg
Phase description
(a)
200
0.6
(Ь)
125
1600
(c)
1000
2950
(d)
75
500
(e)
850
0.0
4-Determine the specific volume of superheated water vapor at 10
MPa and 400°C.
5-A 1.8-m3 rigid tank contains steam at 220°C. Onethird of the
volume is in the liquid phase and the rest is in the vapor form.
Determine (a) the pressure of the steam, (b) the quality of the
saturated mixture.
6- Find the specific volume, enthalpy and internal energy of wet
steam at
18 bar, dryness fraction 0.85.
7- Find the dryness fraction, specific…
Chapter 15 Solutions
Thermodynamics: An Engineering Approach
Ch. 15.7 - What are the approximate chemical compositions of...Ch. 15.7 - How does the presence of N2 in air affect the...Ch. 15.7 - Prob. 3PCh. 15.7 - Prob. 4PCh. 15.7 - Is the airfuel ratio expressed on a mole basis...Ch. 15.7 - How does the presence of moisture in air affect...Ch. 15.7 - Prob. 7PCh. 15.7 - Prob. 8PCh. 15.7 - Prob. 9PCh. 15.7 - Are complete combustion and theoretical combustion...
Ch. 15.7 - What does 100 percent theoretical air represent?Ch. 15.7 - Consider a fuel that is burned with (a) 130...Ch. 15.7 - What are the causes of incomplete combustion?Ch. 15.7 - Which is more likely to be found in the products...Ch. 15.7 - Methane (CH4) is burned with the stoichiometric...Ch. 15.7 - Prob. 16PCh. 15.7 - n-Butane fuel (C4H10) is burned with the...Ch. 15.7 - Prob. 18PCh. 15.7 - Propane (C3H8) is burned with 75 percent excess...Ch. 15.7 - Propane fuel (C3H8) is burned with 30 percent...Ch. 15.7 - In a combustion chamber, ethane (C2H6) is burned...Ch. 15.7 - Prob. 22PCh. 15.7 - Prob. 23PCh. 15.7 - Ethane (C2H6) is burned with 20 percent excess air...Ch. 15.7 - Octane (C8H18) is burned with 250 percent...Ch. 15.7 - Prob. 26PCh. 15.7 - A fuel mixture of 60 percent by mass methane (CH4)...Ch. 15.7 - Prob. 28PCh. 15.7 - A certain natural gas has the following volumetric...Ch. 15.7 - Prob. 30PCh. 15.7 - A gaseous fuel with a volumetric analysis of 45...Ch. 15.7 - Prob. 33PCh. 15.7 - The fuel mixer in a natural gas burner mixes...Ch. 15.7 - Prob. 35PCh. 15.7 - Prob. 36PCh. 15.7 - Determine the fuelair ratio when coal from...Ch. 15.7 - Prob. 38PCh. 15.7 - Prob. 39PCh. 15.7 - Prob. 40PCh. 15.7 - Prob. 41PCh. 15.7 - When are the enthalpy of formation and the...Ch. 15.7 - Prob. 43PCh. 15.7 - Prob. 44PCh. 15.7 - Prob. 45PCh. 15.7 - Prob. 46PCh. 15.7 - Prob. 48PCh. 15.7 - Repeat Prob. 1546 for liquid octane (C8H18).Ch. 15.7 - Ethane (C2H6) is burned at atmospheric pressure...Ch. 15.7 - Reconsider Prob. 1550. What minimum pressure of...Ch. 15.7 - Calculate the HHV and LHV of gaseous n-octane fuel...Ch. 15.7 - Prob. 53PCh. 15.7 - Consider a complete combustion process during...Ch. 15.7 - Prob. 56PCh. 15.7 - Prob. 57PCh. 15.7 - Prob. 58PCh. 15.7 - Propane fuel (C3H8) is burned with an airfuel...Ch. 15.7 - Prob. 60PCh. 15.7 - Prob. 61PCh. 15.7 - Prob. 62PCh. 15.7 - Octane gas (C8H18) at 25C is burned steadily with...Ch. 15.7 - Liquid ethyl alcohol [C2H5OH(l)] at 25C is burned...Ch. 15.7 - Prob. 66PCh. 15.7 - A gaseous fuel mixture that is 40 percent propane...Ch. 15.7 - A constant-volume tank contains a mixture of 120 g...Ch. 15.7 - Prob. 70PCh. 15.7 - Prob. 71PCh. 15.7 - Prob. 72PCh. 15.7 - A fuel is completely burned first with the...Ch. 15.7 - Prob. 74PCh. 15.7 - Prob. 75PCh. 15.7 - What is the adiabatic flame temperature of methane...Ch. 15.7 - Octane gas (C8H18) at 25C is burned steadily with...Ch. 15.7 - Acetylene gas (C2H2) at 25C is burned during a...Ch. 15.7 - Ethyl alcohol [C2H5OH(g)] is burned with 200...Ch. 15.7 - Prob. 81PCh. 15.7 - Prob. 82PCh. 15.7 - Reconsider Prob. 1582. The combustion products are...Ch. 15.7 - Express the increase of entropy principle for...Ch. 15.7 - Prob. 85PCh. 15.7 - What does the Gibbs function of formation gf of a...Ch. 15.7 - Liquid octane (C8H18) enters a steady-flow...Ch. 15.7 - Prob. 88PCh. 15.7 - Reconsider Prob. 1588. The automobile engine is to...Ch. 15.7 - Benzene gas (C6H6) at 1 atm and 77F is burned...Ch. 15.7 - Prob. 91PCh. 15.7 - n-Octane [C8H18(l)] is burned in the...Ch. 15.7 - A steady-flow combustion chamber is supplied with...Ch. 15.7 - Prob. 94RPCh. 15.7 - Prob. 95RPCh. 15.7 - Prob. 96RPCh. 15.7 - Prob. 97RPCh. 15.7 - Prob. 98RPCh. 15.7 - Prob. 99RPCh. 15.7 - n-Butane (C4H10) is burned with the stoichiometric...Ch. 15.7 - A gaseous fuel mixture of 60 percent propane...Ch. 15.7 - Calculate the higher and lower heating values of...Ch. 15.7 - Prob. 103RPCh. 15.7 - Methane gas (CH4) at 25C is burned steadily with...Ch. 15.7 - A 6-m3 rigid tank initially contains a mixture of...Ch. 15.7 - Propane gas (C3H8) enters a steady-flow combustion...Ch. 15.7 - Determine the highest possible temperature that...Ch. 15.7 - Liquid propane [C3H8(l)] enters a combustion...Ch. 15.7 - Prob. 109RPCh. 15.7 - Prob. 110RPCh. 15.7 - Prob. 111RPCh. 15.7 - A steam boiler heats liquid water at 200C to...Ch. 15.7 - Repeat Prob. 15112 using a coal from Utah that has...Ch. 15.7 - Liquid octane (C8H18) enters a steady-flow...Ch. 15.7 - Prob. 115RPCh. 15.7 - Consider the combustion of a mixture of an...Ch. 15.7 - Prob. 117RPCh. 15.7 - A fuel is burned steadily in a combustion chamber....Ch. 15.7 - A fuel is burned with 70 percent theoretical air....Ch. 15.7 - Prob. 126FEPCh. 15.7 - One kmol of methane (CH4) is burned with an...Ch. 15.7 - The higher heating value of a hydrocarbon fuel...Ch. 15.7 - Acetylene gas (C2H2) is burned completely during a...Ch. 15.7 - An equimolar mixture of carbon dioxide and water...Ch. 15.7 - A fuel is burned during a steady-flow combustion...
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- ! Required information Problem 13.067 Piston NOTE: This is a multi-part question. Once an answer is submitted, you will be unable to return to this part. A piston-cylinder device contains a mixture of 0.4 kg of H₂ and 1.2 kg of N2 at 100 kPa and 300 K. Heat is now transferred to the mixture at constant pressure until the volume is doubled. Assume constant specific heats at the average temperature. Problem 13.067.a Piston Determine the heat transfer. Use the table containing the ideal-gas specific heats of various common gases. The heat transfer is kJ.arrow_forward16. What is the most nearly the combined volume of 1.0g of hydrogen gas and 7.0g of helium gas when confined at 35°C and 8atm? c. 12.5200Lİ a. 12.7251Lİ b. 13.0432Lİ с. d. 12.6430Lİarrow_forwardWhich process results in the greatest endothermic change for 10.0g of H2Oarrow_forward
- A well-insulated rigid vessel, divided by a partition, has 0.2 kmol of carbon dioxide at 30 deg. C and 2 bar in one section and 3 kmol of hydrogen gas at 40 deg. C and 4 bar in the other section. The partition is removed and the gases mix. The specific heat capacity, pc of hydrogen and carbon dioxide are14.35 Jkg-1K-1 and 0.84 Jkg-1K-1 respectively. Determine the final equilibrium pressure of the gas mixture.arrow_forward2. A well-insulated rigid vessel, divided by a partition, has 0.2 kmol of carbon dioxide at 30 deg. C and 2 bar in one section and 3 kmol of hydrogen gas at 40 deg. C and 4 bar in the other section. The partition is removed and the gases mix. The specific heat capacity, pc of hydrogen and carbon dioxide are14.35 Jkg-1K-1 and 0.84 Jkg-1K-1 respectively. Determine the final equilibrium temperature of the gas mixture. Show complete solution.arrow_forward2. Ideal 128 (kg) of O2 and 44 (kg) of CO2 contained in a box are kept separated by a partition. At some point, the partition is removed and the gases are allowed to mix. Both gases are at 2 (atm) and 500 (k), and the final mixture is state is at 2 (atm) and 500 (K). Calculate the change in entropy in mixing.arrow_forward
- Specific volume of the mixture is given by *arrow_forwardA gas mixture comprises 5 kmol oxygen, 3 kmol nitrogen, 2 kmol methane, and 0.5 kmol water vapor. The pressure of the gas mixture is 100 kPa. The partial pressure of water vapor in the gas mixture is (a) 4.76 kPa (b) 2100 kPa (c) 5882 Pa (d) 10.5 kPa TRIEarrow_forwardCurrent Attempt in Progress The molar analysis of a gas mixture at 25°C, 90 kPa is 40% N2, 40% CO2, and 20% O2. Step 1 Your answer is correct. Determine the analysis in terms of mass fractions. mfN₂ = SAM 15 mfco₂ = mfo₂ = *** 0.318 0.182 tv MacBook Air ***** W zoom Attempts: 1 of 3 used Question 29 mod Sarrow_forward
- 1. Which of the following has higher positional entropy? a. Solid CO2 or Gaseous CO2? b. N2 gas at 1 atm or N2 gas at 1.0 x 102 atm?arrow_forwardIdentify if the following phase is saturated, subcooled, superheated, or wet- mixture. Pressure Specific Enthalpy Phase MPa kJ/kg 13 2483 ?arrow_forwardThe partial pressures of a four-component gaseous mixture (CO, CH4, N2, A) at 90 deg F are respectively: 7, 21, 14, 28 psia. For the mixture, find its pressure in kPa.arrow_forward
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