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General Chemistry

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Chemical Reactions

Question
14 out of 15
 

Passage 1

Information regarding the amounts of substances that actually react to form the products are of extreme help. Analyzing reactions and having the balanced equations help chemists to determine the correct and optimum proportions of reactants to be used. There are various other factors besides the amount of reactants, which determine the efficiency of reactions.

Experiment 1

Student 1 used 40.5 g of aluminum and 80 g of Fe2O3 for Reaction I. A second student conducted the same reaction with a different amount for one of the reactants. The second student used 40.5 g of aluminum, and 90 grams of Fe2O3. A third student also conducted the same reaction with 54 g of aluminum and the same amount of Fe2O3 used by the first student.

Experiment 2

Reaction II involved the production of Al2O3 from aluminum hydroxide This was done by heating aluminum hydroxide.


Experiment 3


In the previous question, which of the reactants acts as the limiting reagent?

A Fe2O3
B CO
C CO2
D Cannot be determined

Ans. B Based on the question, we can say that about 0.5 mol of Fe2O3 and 0.5 mol CO was present in the reacting mixture. Since the Fe2O3 to CO reacting ratio is 1:3, CO will completely react, and there will be some leftover unreacted Fe2O3 after the reaction is complete. So the limiting reagent is CO.

Chemical Reactions Flashcard List

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