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    I think for some of these exercises you will have to setup stoichiometry tables, and there is the in/out thing going on. I know it's not complicated, it's just I missed the material.

    1. Oilseed protein sources include soybean, cottonseed, peanut, sunflower, copra, rapeseed, sesame, safflower, caster, and flax. Commonly, the separation of the oil from the protein meal is performed by solvent extraction. The analysis of cottonseed is 4% hull, 10% linter, 37% meal, and 49% oil. During the extraction step, about 2 kg solvent, hexane, must be used per 1 kg clean seeds processed (see figure below). For each 1000 kg of raw seeds to be processed, determine the amount of oil and oil-free meal produced and the amount of hexane that must be recycled through the solvent extraction unit.

    2. Methane and oxygen are fed into a furnace where all of the oxygen is consumed. The composition of the exhaust gas is determined using a gas chromatograph. The gas chromatograph separates the components of a sample and provides a measure of the amount of each component in the sample. The output from a chromatographic analysis typically takes the form of a series of peaks on a strip-chart recorder as shown below. For each of the species represented, the area under the peak is approximately proportional to the number of moles of the indicated substance.
    a. Determine the molar and mass composition of the exhaust gas.
    b. What is the molar feed rate of the methane if 200 mol/hr of CO are produced?
    c. If oxygen is fed at 20 °C and 1 atm, what is the volume flow rate of oxygen to the furnace?

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    At problem 2, please add following:

    For O2, we need ...

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