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Problem: The reaction between propane and hydrogen chloride to form propyl chloride and hydrogen is carried out in a continuous reactor. The product stream is analyzed and found to contain 27.45 mole% C3H7Cl, 27.45 mole % H2 and 14.6% HCl. The feed to the reactor contains only propane and hydrogen chloride. Calculate the fractional conversion of the limiting reactant and the percentage by which the other reactant is in excess. If the molar flow rate of the feed stream is 290 mol/s, what is the extent of reaction? (Give its numerical value and its units.) Explanation: We most certainly can use mole fractions here because they are almost always useful information given in a problem statement. There are a couple of different ways we can use mole fractions, but we're going to only use them one of those ways. One way to use mole fraction is to use it to get between total flowrates and the flowrates of individual compounds. Here, we might or might not know any flowrates so we'll do this step later on. Another thing we can do with mole or mass fractions is to find out all the compounds in our system. Take a minute to add up the mole fractions in our problem statement for our product stream. What do our given product mole fractions add up to?
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