Stoichiometric Calculations

Question 1

It was determined that H2 was the limiting reactant. What is the excess reactant?

Revolt · Accepted Answer

B: oxygen

Question 2

Sam follows the directions on a box of pancake mix. The box says that it makes 10 pancakes, but he is able to make 8 pancakes from the ingredients. In this case, the number 10 represents which type of yield?

Revolt · Accepted Answer

B: theoretical yield

Question 3

Abby mixes 2 moles hydrogen with 1 mole oxygen to produce water. She expects to produce 2 moles water, but she captures 1.5 moles water. In this case, the value 1.5 moles represents which type of yield?

Revolt · Accepted Answer

A: actual yield

Question 4

Did you perform the calculations correctly?

Revolt · Accepted Answer

A: Yes, I got the correct theoretical yield and percent yield.; B: No, I got the correct theoretical yield but calculated the percent yield incorrectly.; C: No, I calculated the theoretical yield incorrectly, so my percent yield calculation was also incorrect.; D: No, I used the correct equations, but I got the wrong answer because of a math error.

Question 5

Which reactant is the limiting reactant?

Revolt · Accepted Answer

A: hydrogen

Question 6

The excess reactant is the reactant that is used up in a chemical reaction.

Revolt · Accepted Answer

C: not

Question 7

The balanced chemical equation for the reaction is shown below: 2HgO 2Hg + O2Did you start with the correct equation?

Revolt · Accepted Answer

A: Yes, I started with the correct equation and got the correct percent yield.; B: No, I did not start with the correct equation.; C: Yes, I started with the correct equation but got the incorrect percent yield because of a math error.

Question 8

The balanced chemical equation for the reaction is shown below: CH4 + 2O2 CO2 + 2H2ODid you start with the correct equation?

Revolt · Accepted Answer

A: Yes, I started with the correct equation and got the correct percent yield.; B: No, I did not start with the correct equation.; C: Yes, I started with the correct equation but got the incorrect percent yield because of a math error.

Question 9

After determining the amount of moles required for one of the reactants, it was shown that was the limiting reactant and was the excess reactant.

Revolt · Accepted Answer

A: copper

Question 10

After determining the amount of moles required for one of the reactants, it was shown that was the limiting reactant and was the excess reactant.

Revolt · Accepted Answer

B: sulfur

Stoichiometric Calculations Answers

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