A plant passes ethene and steam over a phosphoric acid catalyst…
Contributed by StemPy LabTry it on paper first. A hint, the key idea and the worked solution are here when you need them.
A plant passes ethene and steam over a phosphoric acid catalyst. The mixture is recycled, and the overall yield of ethanol is of the ethene fed in. The plant feeds in of ethene. Use for ethene and for ethanol. Find the amount of ethene in kmol, the amount of ethanol produced in kmol, and the mass of ethanol in kg.
Need a reminder? The key ideaShow
Acid hydration puts OH on the more substituted carbon. Hydroboration then oxidation puts it on the less substituted carbon, and one BH takes three alkene molecules. NaBH reduces four C=O groups for each formula unit. A Grignard reagent adds its R group to the carbonyl carbon. Yield .
The worked solution
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Work it out on paper first. It is fine to get stuck or make a mistake: that is how we learn. When you are ready, go through the solution one step at a time, and check each step against your own.
Given. of ethene, overall yield.
Plan. Change the mass to kmol, apply the yield, and change back to mass.
Step 1. Ethene. .
Step 2. Ethanol. The equation is , one to one. At : .
Step 3. Mass. .
Check. The mass of ethanol is larger than the mass of ethene, because water is added. With a full yield it would be , and of that is .
Answer: , and .
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