Question 11 : 10 KPa of water vapor at 27^oC is saturated with air in a system, what is the mole fraction of air?
1. 0.21
2. 0.46
3. 0.79
4. 0.91
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Question 12 : 100 KPa of water vapor at 27^oC is saturated with air in a system, what is the mole fraction of air?
1. 0.230
2. 0.306
3. 0.425
4. 0.503
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Question 13 : Ethanol is burnt with required amount of O₂ at atmospheric pressure, the conversion of ethanol is 100%, what is the pressure at due point?
1. 0.2 atm
2. 0.4 atm
3. 0.6 atm
4. 0.8 atm
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Question 14 : Ethane is burnt with 20% excess O₂ at 2 atm, conversion rate of ethane is 50%, what is the pressure at due point?
1. 0.45 atm
2. 0.75 atm
3. 0.9 atm
4. 1 atm
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Question 15 : CH₄ is burnt with 100% excess O₂ at atmospheric pressure, if CH₄ conversion is 100%, what is the pressure at dew point?
1. 0.2 atm
2. 0.4 atm
3. 0.6 atm
4. 0.8 atm
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Question 16 : What is the dew point of water at standard conditions?
1. 32^oF
2. 212^oF
3. 372^oF
4. 584^oF
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Question 17 : The partial pressure of a system at 49^oC is 125 mm Hg and saturated ammonia vapor has partial pressure 20 mm Hg at 49^oC, what is the fraction of ammonia vapor in the system?
1. 0.04
2. 0.08
3. 0.16
4. 0.24
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Question 18 : A system has partial pressure 500 mm Hg and the saturated water vapor has partial pressure 25 mm Hg, what is the fraction of water vapor in the system?
1. 0.01
2. 0.05
3. 0.1
4. 0.5
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Question 19 : A container has vapor H₂O with partial pressure 9 atm, what is fraction of air in the vessel?
1. 0.1
2. 0.4
3. 0.7
4. 0.9
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Question 20 : A vessel contains air and vapor H₂O, if the partial pressure of vapor H₂O is 4 atm and pressure of air is 1 atm, what is the fraction of vapor H₂O in vessel?
1. 0.25
2. 0.5
3. 0.75
4. 0.8
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