Tutor profile: Katia G.
Subject: Organic Chemistry
Given maleic acid (HO₂CCH=CHCO₂H) in the Z conformation and butadiene, what product do you expect to form through cycloaddition? Include stereochemistry.
This is a Diels Alder problem, with the acid as the dienophile and butadiene as the diene. When the cycloaddition occurs, the product formed will be a cyclohexene with carboxyl groups at the C1 and C6 position and the double bond between C3 and C4. The carboxyl groups will add syn thus be on the same side of the ring.
Given the following equation: Na2CO3 + MgCl2 --> 2NaCl + MgCO3 You start with 3.0 g of sodium carbonate and 5.0 g of magnesium chloride. What is the limiting reagent? What is the theoretical yield of magnesium carbonate?
Sodium carbonate is the limiting reagent, which will yield 0.028 moles of MgCO3. Meanwhile, reacting all the magnesium chloride would produce 0.056 moles of product, so this reagent is in excess.
Subject: Basic Chemistry
According to Le Chatelier's principle, what effect would an increase in volume have on the following equilibrium? 3H2 (g) + CO (g) --> H2O (g) + CH4 (g)
The equilibrium would shift to the left to favor the reactants. We can think of an increase in volume as a decrease in pressure, since there are fewer collisions with the container when our system increases volume. A decrease in pressure will favor the side of the reaction with more molecules of gas. The left side has 4 molecules total, while the right only has 2, so reactants are favored.
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