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General Chemistry

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Chemical Reactions

Question
15 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


If 0.1 mol of CO was reacted with excess of Fe2O3, how many molecules of carbon dioxide will be produced?

A 6.0 x 1023molecules
B 6.0 x 1022molecules
C 3.0 x 1023molecules
D 18.0 x 1023molecules

Ans. B This question tests your understanding of the mole concept. Since we have excess amounts of Fe2O3, we do not have to worry about it. But, what you should consider is that the amount of CO present dictates the reaction. One mol of CO2 contains Avogadro number (6.02 x 1023) of molecules. The reaction results in 0.1 mol of CO2. So 0.1 mol of CO2 contains 6.02 x 1022 molecules.

Chemical Reactions Flashcard List

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