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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: This problem involves a reaction so we know we need to work in mole quantities of some sore, like mol or mol/s or lb-mol, etc. If we had a reaction and were given mass information instead of mole information, then we'd have to convert all the masses over to moles so we could use them in our extents of reaction equations. We were given mole percents in our problem, too, so we don't need to convert those to anything else. Sometimes we're given mass percents for a reaction problem and it is just easier to convert those to mole percents so we don't mess up later on in the middle of the problem when we're starting to use numbers. Many of these details that you're reading now are learned over time as you solve more problems so don't worry if you didn't get this part right. Just be persistent and keep paying attention to how you get to the right answers on your solutions. |
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