# Chemical Process Calculation Questions and Answers – Real gas Mixture

This set of Advanced Chemical Process Calculation Questions & Answers focuses on “Real Gas Mixture”.

1. Pseudocritical values for mixture of gases are calculated on the assumption that each component in the mixture contributes to the pseudocritical values in the same proportion as the mole fraction of that component in the gas is
a) Kay’s Method
b) Dalton’s Method
c) Holburn’s Method
d) None of the mentioned

Explanation: Pseudocritical values for mixture of gases are calculated on the assumption that each component in the mixture contributes to the pseudocritical values in the same proportion as the mole fraction of that component in the gas is Kay’s Method.

2. According to Kay`s method the pseudocritical values are
Statement I: P`c = Pc(A)*y(A) + Pc(B)*y(B) + ………
Statement II: T`c = Tc(A)*y(A) + Tc(B)*y(B) + ……..
a) Both statements are correct
b) Both statements are false
c) Statement I is true and Statement II is false
d) Statement I is false and Statement II is true

Explanation: Pseudocritical values for mixture of gases are calculated on the assumption that each component in the mixture contributes to the pseudocitical values in the same proportion as the mole fraction of that component in the gas.

3. A gaseous mixture have the following composition in mole percent and properties
Component    Mole percent    Tc(K)    Pc(atm)
CH4                       25%         191         45.8
C2H4                     35%          283        50.5
N2                          40%         126         33.5
at 90 atm pressure and 100 degree celsius. P`r and T`r are psuedoreduced values. & P`c and T`c are pseudocitical values.
3-8. Volume per mole according to ideal gas law?
a) 140 cm3/g mol
b) 240 cm3/g mol
c) 340 cm3/g mol
d) 440 cm3/g mol

Explanation: v = RT/P.

4. What is the value of P`c?
a) 42.5 atm
b) 32.5 atm
c) 22.5 atm
d) 12.5 atm

Explanation: P`c = Pc(A)*y(A) + Pc(B)*y(B) + ………

5. What is the value of T`c?
a) 197.2 K
b) 297.2 K
c) 397.2 K
d) 497.2 K

Explanation: T`c = Tc(A)*y(A) + Tc(B)*y(B) + ……..

6. What is the value of P`r?
a) 1.11
b) 2.11
c) 3.11
d) 4.11

Explanation: P`r = P/P`c.

7. What is the value of T`r?
a) 1.89
b) 2.89
c) 3.89
d) 4.89

Explanation: T`r = T/T`c.

8. Volume using Kay`s method? Use z = 0.95.
a) 123 cm3/g mol
b) 223 cm3/g mol
c) 323 cm3/g mol
d) 423 cm3/g mol

Explanation: v = zRT/P.

9. A technique of estimating physical properties of compound by using properties of molecular group of elements in the compound. Is called
a) Group contribution method
b) Generalized group method
c) Kay`s Method
d) None of the mentioned

Explanation: A technique of estimating physical properties of compound by using properties of molecular group of elements in the compound is called Group contribution method.

10. Find the incorrect statement
a) Van der Waals Equation: Two parameter equation of state
b) SRK Equation: Three parameter equation of state
c) Peng Robinson: Three parameter equation of state
d) None of the mentioned

Explanation: Van der Waals, SRK and Peng Robinson are two, three and three parameter equation of state.

Sanfoundry Global Education & Learning Series – Chemical Process Calculation.
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