Reference no: EM132251887

Question 1. A natural gas mixture contains the following components by weight: 89.7% Methane, 5.7% Ethane and 4.6% Propane. What are the mol% of the components in natural gas?

Question 2. A gas consists of the following components (in mol%) 30.0% Benzene, 20.0% Toluene and the remaining 50% is air (Nitrogen and Oxygen in the same ratio found in air). Determine the mass percents of all 4 components in the gas mixture.

Question 3. A liquid stream of water and methanol is flowing at a rate of 380.0 ft³/h. The specific gravity of this mixture is 0.9313. The molar composition is 20.0% methanol and 80.0% water
a. What is the flow rate of this stream in kg/h?
b. What is the total molar flow rate of the mixture (mol/h) (Hint: use average molecular weight)
c. What is the mass fraction of methanol and the mass fraction of water in the stream?

Question 4. The following reactions take place in a continuous reactor at steady state:

C₂H₆ → C₂H₄ + H₂

C₂H₆ + H₂ → 2C₂H₄

100 mol/h is fed to the reactor. This feed contains 80% ethane and the rest is nitrogen. The fractional conversion of ethane is .65 and the yield of ethylene is 0.375. What is the molar composition (mol%) of the gases leaving the reactor? What is the selectivity of ethylene to methane?

Try solving this problem using both atomic balances and extent of reaction for more practice

Question 5. Ethanol (desired) is produced by hydrating ethylene (for commercial purposes, not for drinking).

C₂H₄ + H₂O → C₂H₅OH

Some of the ethanol reacts to produce diethyl ether (undesired) in a side reaction

C₂H₅OH → (C₂H₅)₂O + H₂O

The reactor feed contains 44.8% C₂H₄, 46.1% H₂O and 9.1% Interts. The percent conversion of C₂H₄ is 6.0%, The fractional yield of ethanol is 0.054 and the selectivity of ethanol to diethyl ether is 17.9.What is the composition (mol%) of the stream leaving the reactor?

There are still some misconceptions about calculating XS air for a combustion reaction. If you do not get the correct answer below, read section 4.8b in your textbook (pg 145)

Question 6. Hexane is burned with 10% excess air. The hexane conversion is 0.80. Of the hexane that combusts, 90% is complete forming CO₂ and 10% is incomplete combustion, forming CO. What is the amount of air that must be supplied per 100 mol hexane.