Q: A tablet contains 325 mg of acetylsalicylic acid ($C_9H_8O_4$). How many molecules of acetylsalicylic acid are present? (Molar mass = 180.16 g/mol, $N_A = 6.022 \times 10^{23}$ mol$^{-1}$)

$1.09 \times 10^{21}$ molecules

Question 1

Which of the following statements best describes the difference between a mixture and a compound?

Accepted Answer

A mixture contains elements in any proportion, while a compound contains elements in definite, fixed proportions.

Question 2

Which type of chemical bond involves the transfer of electrons from one atom to another?

Accepted Answer

Ionic bond

Question 3

What is the empirical formula for a compound containing 24.5 g nitrogen and 70.0 g oxygen?

Accepted Answer

$NO_2$

Question 4

Which of the following is a molecular compound?

Accepted Answer

CO$_2$

Question 5

What is the correct name for the compound $FeCl_3$?

Accepted Answer

Iron(III) chloride

Question 6

Which formula represents a compound with a 1:1 ratio of sodium ions to chloride ions?

Accepted Answer

$NaCl$

Question 7

Calculate the mass percent of sodium in sodium oxide ($Na_2O$). (Atomic masses: Na = 22.99 g/mol, O = 16.00 g/mol)

Accepted Answer

62.0%

Question 8

Which of the following is the correct molecular formula for a compound with an empirical formula of $CH$ and a molar mass of 78.11 g/mol? (Atomic masses: C = 12.01 g/mol, H = 1.01 g/mol)

Accepted Answer

$C_6H_6$

Question 9

Which of the following ions is a polyatomic ion?

Accepted Answer

$NO_3^-$

Question 10

What is the correct name for $Na_2SO_4 \cdot 10H_2O$?

Accepted Answer

Sodium sulfate decahydrate

Question 11

Which of the following is the correct formula for aluminum oxide?

Accepted Answer

$Al_2O_3$

Question 12

A 7.25 mL sample of butane ($C_4H_{10}$) has a density of 0.601 g/mL. How many grams of carbon are present in the sample?

Accepted Answer

3.49 g

Question 13

Which of the following acids is an oxyacid?

Accepted Answer

H$_2$SO$_4$

Question 14

What is the formula mass of glucose ($C_6H_{12}O_6$)? (Atomic masses: C = 12.01 g/mol, H = 1.01 g/mol, O = 16.00 g/mol)

Accepted Answer

180.16 g/mol

Question 15

Which of the following is the correct name for $N_2O_5$?

Accepted Answer

Dinitrogen pentoxide

Question 16

Which of the following is a hydrocarbon containing only single bonds?

Accepted Answer

Propane ($C_3H_8$)

Question 17

What is the correct name for $Cu_2O$?

Accepted Answer

Copper(I) oxide

Question 18

Which of the following is the correct formula for magnesium nitrate?

Accepted Answer

$Mg(NO_3)_2$

Question 19

A tablet contains 325 mg of acetylsalicylic acid ($C_9H_8O_4$). How many molecules of acetylsalicylic acid are present? (Molar mass = 180.16 g/mol, $N_A = 6.022 	imes 10^{23}$ mol$^{-1}$)

Accepted Answer

$1.09 	imes 10^{21}$ molecules

Question 20

Which of the following is the correct name for $HNO_2$?

Accepted Answer

Nitrous acid

Molecules and Compounds: Structure, Bonding, and Formulas

Study Guide - Practice Questions

Study Guide - Flashcards