AP Chemistry - Limiting Reagent

1

What determines the amount of product formed in an irreversible reaction?

2

Consider the reaction of potassium carbonate with calcium nitrate to form potassium nitrate and calcium carbonate:

$K_{2}CO_{3} (aq) + Ca(NO_{3})_{2} (aq) \rightarrow CaCO_{3} (s) + 2KNO_{3} (aq)$

Suppose 50ml of a 0.250M potassium carbonate solution was mixed with 100ml of a 0.175M calcium nitrate solution. What is the maximum amount of calcium carbonate that could be obtained?

3

Magnesium will combine with oxygen gas to form magnesium oxide according to the balanced equation below.

$2Mg + O_{2}\rightarrow2MgO$

60 grams of magnesium metal and 30 grams of oxygen gas are allowed to react. If the reaction runs to completion, which reactant will be depleted first?

4

Consider the following reaction:

$8Fe\hspace{1 mm}+S_8\hspace{1 mm}\rightarrow8FeS$

If we begin with 293 g Fe and 17.2 g $S_8$ , how many grams of $FeS$ will we create?

5

The formation of ammonia is given by the following equation:

$3H_2+N_2\rightarrow 2NH_3$

If you start the reaction with 12g of hydrogen gas and 64g of nitrogen gas, which will be the limiting reagent?

6

Consider the following balanced reaction.

$Cl_{2(g)} + 2KI_{(aq)} \rightarrow 2KCl_{(aq)} + I_{2}_{(s)}$

If you start with 100 grams of chlorine gas and 500 grams of potassium iodide, how many grams of the excess reagent will remain after the reaction has run to completion?

7

Consider the following reaction:

$2Na+2H_2O\rightarrow 2NaOH+H_2$

If you have 36 grams of $Na$ and 53 mL $H_2O$ , will you have any remaining sodium and/or water? How much of each?

8

Consider the following balanced reaction.

$Cl_{2(g)} + 2KI_{(aq)} \rightarrow 2KCl_{(aq)} + I_{2}_{(s)}$

If the reaction starts with 8 moles of chlorine gas and 10 moles of potassium iodide, how many moles of the excess reagent will be left over after the reaction has run to completion?

9

Given the reaction

H2SO4 (aq) + 2 LiOH (aq) → Li2SO4 (aq) + 2 H2O (l)

If you have 100g of H2SO4 and 65g of LiOH. What is your limiting reactant?

10

When grilling out, many people utilize the combustion of propane to provide the heat energy needed to cook their food. The chemical equation for this reaction is shown below:

$C_3H_8_{(g)}+5O_2_{(g)}\rightarrow 3CO_2_{(g)}+4H_2O_{(g)}$

You notice that your gas grill is producing a large amount of soot, which is negatively impacting the taste of your food. Please select the best explanation of this phenomenon, and it's corresponding solution.

Limiting Reagent

Practice Questions