Q: Which of the following is the correct formula for calculating molarity?

$$\mathrm{M = \frac{\text{amount\ of\ solute\ (mol)}}{\text{volume\ of\ solution\ (L)}}}$$

Question 1

Consider the reaction $$\mathrm{N_2$(g) + 3H_2(g) \rightarrow 2NH_3(g)}. $$The first image shows a flask containing a mixture of $$\mathrm{N_2$}$$ and $$\mathrm{H_2$}$$ molecules. After the reaction goes to completion, which of the following images (a, b, or c) best represents the contents of the flask? Which reactant is limiting, and which is in excess?

Accepted Answer

Image (a); $$\mathrm{N_2$} is $$limiting, $$\mathrm{H_2$} is in $$excess.

Question 2

Given 42.5 g of Mg and 33.8 g of $$\mathrm{O_2$}$$, what is the theoretical yield of $$\mathrm{MgO} in $$grams for the reaction $$2\mathrm{Mg}(s) + \mathrm{O_2$}(g) \rightarrow 2\mathrm{MgO}(s)$$?

Accepted Answer

$$70.5\ \mathrm{g}$$

Question 3

Which alkali metal reacts most vigorously with water, as shown in the images of lithium, sodium, and potassium reacting with water?

Accepted Answer

Potassium

Question 4

Which of the following best describes a concentrated solution?

Accepted Answer

A solution with a relatively large amount of solute compared to solvent.

Question 5

What is the molarity of a solution prepared by dissolving 25.5 g NaCl (FW 58.44 g/mol) in enough water to make 1.75 L of solution?

Accepted Answer

$$0.250\ \mathrm{M}$$

Question 6

Which of the following solutions will conduct electricity?

Accepted Answer

1.0 M KBr

Question 7

Which of the following compounds is insoluble in water according to the solubility rules?

Accepted Answer

AgCl

Question 8

Which of the following is a net ionic equation for the reaction between $$\mathrm{Na_2CO_3(aq)}$$ and $$\mathrm{2HCl(aq)}$$?

Accepted Answer

$$\mathrm{CO_3$^{2-}(aq) + 2H^+(aq) \rightarrow CO_2$(g) + H_2O(l)}$$

Question 9

A student wants to prepare 1.00 L of 1.00 M NaCl solution. Which of the following steps is correct?

Accepted Answer

Weigh out 58.44 g NaCl, dissolve in water, and dilute to 1.00 L.

Question 10

Which of the following is a strong acid?

Accepted Answer

HCl

Question 11

Which of the following is the correct balanced molecular equation for the precipitation reaction between $$\mathrm{KI(aq)}$$ and $$\mathrm{Pb(NO_3$)_2(aq)}$$?

Accepted Answer

$$2\mathrm{KI(aq) + Pb(NO_3$)_2(aq) \rightarrow 2KNO_3(aq) + $$PbI_2$$(s)}$$

Question 12

Which of the following ions is a spectator ion in the reaction $$\mathrm{$$AgNO_3$$(aq) + NaI(aq) \rightarrow AgI(s) + $$NaNO_3$$(aq)}$$?

Accepted Answer

$$\mathrm{NO_3$^-}$$

Question 13

Which of the following best describes the process of dissolving NaCl in water?

Accepted Answer

NaCl dissociates into $$\mathrm{Na^+}$$ and $$\mathrm{Cl^-}$$ ions, which are surrounded by water molecules.

Question 14

Which of the following is the correct net ionic equation for the neutralization reaction between HCl(aq) and NaOH(aq)?

Accepted Answer

$$\mathrm{H^+(aq) + OH^-(aq) \rightarrow H_2O(l)}$$

Question 15

A student mixes equal volumes of 1.0 M A(aq) and 1.0 M B(aq) for the reaction $$2A(aq) + B(aq) \rightarrow C(aq). $$Which reactant is limiting?

Accepted Answer

A

Question 16

Which of the following best describes a weak acid in aqueous solution?

Accepted Answer

It partially ionizes in water.

Question 17

Which of the following is the correct formula for calculating molarity?

Accepted Answer

$$\mathrm{M = \frac{	ext{amount\ of\ solute\ (mol)}}{	ext{volume\ of\ solution\ (L)}}}$$

Question 18

Which of the following metals is most easily oxidized according to the activity series?

Accepted Answer

Na

Question 19

Which of the following is the correct net ionic equation for the precipitation reaction between $$\mathrm{Pb(NO_3$)_2(aq)}$$ and $$\mathrm{2KCl(aq)}$$?

Accepted Answer

$$\mathrm{Pb$$^{2+}$$(aq) + 2Cl^-(aq) \rightarrow $$PbCl_2$$(s)}$$

CHEM 131 Chapter 5: Limiting Reactants, Solution Stoichiometry, and Aqueous Reactions

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