Chemical Process Calculation Questions and Answers – Saturation

This set of Chemical Process Calculation Multiple Choice Questions & Answers (MCQs) focuses on “Saturation”.

1. Antoine equation is a relation between
a) Vapour pressure and partial pressure
b) Vapour pressure and Temperature
c) Vapour pressure and absolute pressure
d) None of the mentioned
View Answer

Answer: b
Explanation: Antoine equation is a relation between Vapour pressure and Temperature.

2. Correct representation of the Antoine equation is
a) ln(p*) = A-B/(C+T)
b) log(p*) = A-B/(C-T)
c) ln(p*) = A+B/(C+T)
d) log(p*) = A-B/(C+T)
View Answer

Answer: b
Explanation: ln(p*) = A-B/(C+T) is the correct representation of Antoine equation. Where: p* & T are Vapour pressure and Temperature respectively and A, B & C are constants.

3. The temperature at which the vapour just start to condense at a specified pressure is
a) Critical temperature
b) Boiling point
c) Dew point
d) Triple point
View Answer

Answer: c
Explanation: The temperature at which the vapour just start to condense at a specified pressure is Dew point.
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4. At dew point the partial pressure of the is equal to the partial pressure of the volatile liquid.
The above given statements is
a) Always correct
b) Incorrect
c) Depends on the properties of the liquid
d) None of the mentioned
View Answer

Answer: b
Explanation: At dew point the partial pressure of the is equal to the vapour pressure of the volatile liquid.

5. What is the pressure of air when the water vapor in air is at 600 mm of Hg and the vapor pressure is 98 mm Hg at 51°C?
a) 502 mm Hg
b) 402 mm Hg
c) 302 mm Hg
d) 202 mm Hg
View Answer

Answer: a
Explanation: The pressure of air is calculated as:
Pair = Ptotal – Pvapor
Pair = 600 – 98 = 502 mm Hg

6. What is the composition of water vapor when the total pressure is 600 mm Hg and the vapor pressure is 98 mm Hg at 51°C?
a) 0.163
b) 0.183
c) 0.2837
d) 0.8367
View Answer

Answer: a
Explanation: The composition of water vapor (mole fraction) is calculated as:
yH2O = Pvapor / Ptotal
yH2O = 98 / 600 = 0.163

7. What is the composition of air when the total pressure is 600 mm Hg and the air pressure is 502 mm Hg?
a) 0.163
b) 0.183
c) 0.2837
d) 0.8367
View Answer

Answer: d
Explanation: The composition of air (mole fraction) is calculated as:
yair = Pair / Ptotal
yair = 502 / 600 = 0.8367
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8. Dew point of water at standard conditions is?
a) 100 K
b) 273 K
c) 373 K
d) 473 K
View Answer

Answer: c
Explanation: Dew point of water at standard condition = 100 Degree Celsius.

9. What is the mole fraction of air in a system where the water vapor pressure is 5 kPa at 300 K, and the total pressure is 101.3 kPa?
a) 0.952
b) 0852
c) 0.259
d) 0.291
View Answer

Answer: a
Explanation: The mole fraction of air is calculated as:
yair = Pair / Ptotal
yair = 101.3 / (5 + 101.3) = 0.952
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10. What is the mole fraction of water vapor in a system where the water vapor pressure is 5 kPa at 300 K, and the total pressure is 101.3 kPa?
a) 0.047
b) 0.057
c) 0.067
d) 0.077
View Answer

Answer: a
Explanation: The mole fraction of water vapor is calculated as:
yH2O = Pvapor / Ptotal
yH2O = 5 / (5 + 101.3) = 0.047

Sanfoundry Global Education & Learning Series – Chemical Process Calculation.
To practice all areas of Chemical Process Calculation, here is complete set of 1000+ Multiple Choice Questions and Answers.

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Manish Bhojasia - Founder & CTO at Sanfoundry
Manish Bhojasia, a technology veteran with 20+ years @ Cisco & Wipro, is Founder and CTO at Sanfoundry. He lives in Bangalore, and focuses on development of Linux Kernel, SAN Technologies, Advanced C, Data Structures & Alogrithms. Stay connected with him at LinkedIn.

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