Question 1

Which of the following is the correctly balanced chemical equation for the complete combustion of octane ($\mathrm{C_8H_{18}}$)?

Accepted Answer

$\mathrm{C_8H_{18}(l) + 12.5\ O_2(g) \rightarrow 8\ CO_2(g) + 9\ H_2O(l)}$

Question 2

Calculate the molar mass of urea ($\mathrm{CO(NH_2)_2}$).

Accepted Answer

$\mathrm{60.0\ g/mol}$

Question 3

A sample contains $100.0\ g$ of urea ($\mathrm{CO(NH_2)_2}$). How many moles of urea are present?

Accepted Answer

$\mathrm{1.333\ mol}$

Question 4

What is the percent by mass of nitrogen in urea ($\mathrm{CO(NH_2)_2}$)?

Accepted Answer

$\mathrm{18.7\%}$

Question 5

How many molecules are present in $8.14 	imes 10^{-2}$ mol of benzene ($\mathrm{C_6H_6}$)?

Accepted Answer

$\mathrm{5.08 	imes 10^{22}}$

Question 6

How many oxygen atoms are present in $3.76 	imes 10^{21}$ molecules of aluminum nitrate ($\mathrm{Al(NO_3)_3}$)?

Accepted Answer

$\mathrm{3.39 	imes 10^{22}}$

Question 7

Given $30.0\ g$ of benzene ($\mathrm{C_6H_6}$) and $65.0\ g$ of bromine ($\mathrm{Br_2}$), what is the limiting reagent in the reaction $\mathrm{C_6H_6 + Br_2 \rightarrow C_6H_5Br + HBr}$?

Accepted Answer

Benzene ($\mathrm{C_6H_6}$)

Question 8

If $42.3\ g$ of $\mathrm{C_6H_5Br}$ is produced from a theoretical yield of $60.3\ g$, what is the percent yield?

Accepted Answer

$\mathrm{70.1\%}$

Question 9

Which of the following is a strong acid and a strong electrolyte?

Accepted Answer

Hydrobromic acid ($\mathrm{HBr}$)

Question 10

Which of the following is a weak acid and a weak electrolyte?

Accepted Answer

Acetic acid ($\mathrm{CH_3COOH}$)

Question 11

What is the net ionic equation for the reaction between $\mathrm{MgSO_4(aq)}$ and $\mathrm{K_2CO_3(aq)}$?

Accepted Answer

$\mathrm{Mg^{2+}(aq) + CO_3^{2-}(aq) \rightarrow MgCO_3(s)}$

Question 12

What is the net ionic equation for the neutralization of acetic acid ($\mathrm{CH_3COOH}$) with barium hydroxide ($\mathrm{Ba(OH)_2}$)?

Accepted Answer

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

Question 13

What is the oxidation state of chlorine in $\mathrm{HClO_3}$?

Accepted Answer

$+3$

Question 14

In the reaction $\mathrm{Fe(s) + Cu(NO_3)_2(aq) \rightarrow Cu(s) + Fe(NO_3)_2(aq)}$, which species is oxidized?

Accepted Answer

$\mathrm{Fe}$

Question 15

What is the net ionic equation for the reaction between iron and copper(II) nitrate?

Accepted Answer

$\mathrm{Fe(s) + Cu^{2+}(aq) \rightarrow Fe^{2+}(aq) + Cu(s)}$

Question 16

What is the molarity of a solution prepared by dissolving $175\ g$ of acetic acid ($\mathrm{CH_3COOH}$, molar mass $60.05\ g/mol$) in $2.00\ L$ of water?

Accepted Answer

$1.46\ M$

Question 17

A $0.30\ M$ NaCl solution is diluted to three times its original volume. What is the final concentration?

Accepted Answer

$0.10\ M$

General Chemistry Study Notes: Stoichiometry, Solutions, Electrolytes, and Chemical Equations

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