Solution Manual for Mass Transfer Operations 3rd Edition by Robert E. Treybal – Complete Step-by-Step Solutions, Solved Problems & Exam Prep Guide

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SOLUTION MANUAL

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1.1 a. Concentration of a gas mixture.
A mixture of noble gases [helium (1), argon (2), krypton (3), and xenon (4)] is at a total pressure of
200 kPa and a temperature of 400 K. If the mixture has equal mole fractions of each of the gases,
determine:
a) The composition of the mixture in terms of mass fractions.

Solution:
Basis: 100 kmole of the mixture




b) The average molecular weight of the mixture.

Solution




c) The total molar concentration.

Solution




d) The mass density.

Solution

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1.2 a. Concentration of a liquid solution fed to a distillation column.
A solution of carbon tetrachloride (1) and carbon disulfide (2) containing 50% by weight each is to
be continuously distilled at the rate of 4,000 kg/h Determine:
a) The concentration of the mixture in terms of mole fractions.

Solution

Basis: 100 kg mixture




b) The average molecular weight of the mixture.

Solution




c) Calculate the feed rate in kmol/h.

Solution

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1.3 a. Concentration of liquified natural gas.
A sample of liquified natural gas, LNG, from Alaska has the following molar composition: 93.5%
CH4, 4.6% C2H6, 1.2% C3H8, and 0.7% CO2. Calculate:
a) Average molecular weight of the LNG mixture.

Solution




b) Weight fraction of CH4 in the mixture.

Solution

Basis: 100 kmoles of LNG




c) The LNG is heated to 300 K and 140 kPa, and vaporizes completely. Estimate the density of the
gas mixture under these conditions.

Solution