Q: A bottle of aspirin contains 200 tablets, each with 100 mg of aspirin (C9H8O4). What is the total number of moles of aspirin in the entire bottle? (Molar mass of aspirin = 180 g/mol)

$\displaystyle 0.111\ \text{mol}$

Q: If 10.0 mL of a 2.0 M $\displaystyle \mathrm{Na}_2\mathrm{CO}_3$ solution is used, how many moles of $\displaystyle \mathrm{Na}^+$ ions are present?

$\displaystyle 0.040\ \text{mol}$

Question 1

A bottle of aspirin contains 200 tablets, each with 100 mg of aspirin (C9H8O4). What is the total number of moles of aspirin in the entire bottle? (Molar mass of aspirin = 180 g/mol)

Accepted Answer

$\displaystyle 0.111\ 	ext{mol}$

Question 2

Which of the following best describes the relationship between mass, moles, and number of molecules for a compound?

Accepted Answer

Mass is converted to moles using molar mass, and moles are converted to molecules using Avogadro's number.

Question 3

A sample contains 0.50 g of element A (molar mass = 25 g/mol) and 1.00 g of element X (molar mass = 50 g/mol). What is the empirical formula of the compound formed?

Accepted Answer

$\displaystyle \mathrm{A}_2\mathrm{X}$

Question 4

Which of the following is the correct balanced equation for the combustion of methane ($\displaystyle \mathrm{CH}_4$)?

Accepted Answer

$\displaystyle \mathrm{CH}_4 + 2\mathrm{O}_2 \rightarrow \mathrm{CO}_2 + 2\mathrm{H}_2\mathrm{O}$

Question 5

If 10.0 mL of a 2.0 M $\displaystyle \mathrm{Na}_2\mathrm{CO}_3$ solution is used, how many moles of $\displaystyle \mathrm{Na}^+$ ions are present?

Accepted Answer

$\displaystyle 0.040\ 	ext{mol}$

Question 6

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

Accepted Answer

$\displaystyle \mathrm{CaCO}_3$

Question 7

Which of the following is a correct net ionic equation for the reaction between $\displaystyle \mathrm{Na}_2\mathrm{CO}_3$ and $\displaystyle \mathrm{CaCl}_2$ in aqueous solution?

Accepted Answer

$\displaystyle \mathrm{Ca}^{2+} (aq) + \mathrm{CO}_3^{2-} (aq) \rightarrow \mathrm{CaCO}_3 (s)$

Question 8

Which of the following statements about oxidation and reduction is correct?

Accepted Answer

Oxidation is the loss of electrons and reduction is the gain of electrons.

Question 9

What is the oxidation number of phosphorus in $\displaystyle \mathrm{Na}_4\mathrm{P}_3\mathrm{O}_{11}$?

Accepted Answer

$\displaystyle +4$

Question 10

Which of the following metals can displace hydrogen from acid, but not from water?

Accepted Answer

Zinc

Question 11

Which halogen can oxidize both $\displaystyle \mathrm{Br}^-$ and $\displaystyle \mathrm{I}^-$ ions?

Accepted Answer

$\displaystyle \mathrm{Cl}_2$

Question 12

A student mixes $\displaystyle \mathrm{Pb(NO}_3)_2$ and $\displaystyle \mathrm{KI}$ in water. What is the precipitate formed?

Accepted Answer

$\displaystyle \mathrm{PbI}_2$

Question 13

Which of the following is a strong electrolyte in aqueous solution?

Accepted Answer

$\displaystyle \mathrm{NaCl}$

Question 14

In the reaction $\displaystyle \mathrm{Mg} (s) + 2\mathrm{HCl} (aq) \rightarrow \mathrm{MgCl}_2 (aq) + \mathrm{H}_2 (g)$, which species is oxidized?

Accepted Answer

$\displaystyle \mathrm{Mg}$

Question 15

A solution contains $\displaystyle \mathrm{AgNO}_3$ and $\displaystyle \mathrm{NaCl}$. What will happen when the two solutions are mixed?

Accepted Answer

A precipitate of $\displaystyle \mathrm{AgCl}$ will form.

Question 16

Which of the following is the correct net ionic equation for the neutralization of $\displaystyle \mathrm{HCl}$ with $\displaystyle \mathrm{NaOH}$?

Accepted Answer

$\displaystyle \mathrm{H}^+ (aq) + \mathrm{OH}^- (aq) \rightarrow \mathrm{H}_2\mathrm{O} (l)$

General Chemistry Study Guide: Mass Relationships and Reactions in Aqueous Solution

Study Guide - Practice Questions

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