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QUESTION: 1

The ratio of mass concentration of species A to the total mass density of the mixture is known as

Solution:

Explanation: It is defined as p _{a}/p.

QUESTION: 2

For a binary mixture of species A and B, the mass average velocity is defined as

Solution:

Explanation: p _{a} V _{a} + p _{b} V _{b}/ p _{a} + p _{b }= p _{a} V _{a} + p _{b} V _{b}/ p.

QUESTION: 3

The ratio of number of moles of species A to the total number of moles of the mixture is known as

Solution:

Explanation: It is defined as n _{a}/n.

QUESTION: 4

A binary mixture of oxygen and nitrogen with partial pressures in the ratio 0.21 and 0.79 is contained in a vessel at 300 K. If the total pressure of the mixture is 1 * 10 ^{5} N/m^{2}, find molar concentration of oxygen

Solution:

Explanation: 0.21 * 10 ^{5}/8341 * 300 = 8.42 * 10 ^{-3} kg mol/m^{3}.

QUESTION: 5

For a binary mixture of species A and B, the molar average velocity is defined as

Solution:

Explanation: n _{A} V _{A} + n _{B} V _{B}/n _{A} + n _{B} = n _{A} V _{A} + n _{B} V _{B}/n.

QUESTION: 6

Given diagram shows diffusion of water vapor through air. Identify the correct statement

Solution:

Explanation: The slight movement of air over the top of the tube does not bring about any change in the concentration profile of air.

QUESTION: 7

A binary mixture of oxygen and nitrogen with partial pressures in the ratio 0.21 and 0.79 is contained in a vessel at 300 K. If the total pressure of the mixture is 1 * 10 ^{5} N/m^{2}, find overall mass density

Solution:

Explanation: For oxygen = 0.269 kg/m^{3} and for nitrogen = 0.887 kg/m^{3}.

QUESTION: 8

A binary mixture of oxygen and nitrogen with partial pressures in the ratio 0.21 and 0.79 is contained in a vessel at 300 K. If the total pressure of the mixture is 1 * 10 ^{5} N/m^{2}, find molar fraction of nitrogen

Solution:

Explanation: Molar fraction is equal to the partial pressure.

QUESTION: 9

A binary mixture of oxygen and nitrogen with partial pressures in the ratio 0.21 and 0.79 is contained in a vessel at 300 K. If the total pressure of the mixture is 1 * 10 ^{5} N/m^{2}, find mass fraction of oxygen

Solution:

Explanation: 0.269/1.156 = 0.233.

QUESTION: 10

A binary mixture of oxygen and nitrogen with partial pressures in the ratio 0.21 and 0.79 is contained in a vessel at 300 K. If the total pressure of the mixture is 1 * 10 ^{5} N/m^{2}, find the average molecular weight of the mixture

Solution:

Explanation: (0.21) (32) + (0.79) (28) = 28.84.

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