Q: How many molecules are in 36.04 g of water ($H_2O$)? (Molar mass of $H_2O$ = 18.02 g/mol, Avogadro's number = $6.022 \times 10^{23}$ molecules/mol)

$1.204 \times 10^{24}$ molecules

Question 1

Which of the following best describes the difference between a mixture and a compound, as illustrated by hydrogen and oxygen gases versus water?

Accepted Answer

A compound has a fixed ratio of elements, while a mixture can have any ratio.

Question 2

Which statement correctly describes an ionic bond?

Accepted Answer

It is the attraction between a cation and an anion.

Question 3

What is the empirical formula for glucose ($C_6H_{12}O_6$)?

Accepted Answer

$CH_2O$

Question 4

Which of the following compounds is most likely to be ionic?

Accepted Answer

NaCl

Question 5

A sample contains 40.0 g of carbon and 6.7 g of hydrogen. What is the empirical formula of the compound? (Atomic masses: C = 12.0 g/mol, H = 1.0 g/mol)

Accepted Answer

$CH_2$

Question 6

Which of the following is the correct name for $Fe^{3+}$?

Accepted Answer

Ferric ion

Question 7

What is the formula mass of water ($H_2O$)? (Atomic masses: H = 1.01 amu, O = 16.00 amu)

Accepted Answer

$18.02$ amu

Question 8

Which of the following is the correct molecular formula for butene?

Accepted Answer

$C_4H_8$

Question 9

Which of the following is a correct rule for naming binary molecular compounds?

Accepted Answer

Prefixes are used to indicate the number of atoms of each element.

Question 10

What is the correct name for $NO_2$?

Accepted Answer

Nitrogen dioxide

Question 11

Which of the following is a polyatomic cation?

Accepted Answer

NH$_4^+$

Question 12

A compound contains 53.5% C, 15.5% H, and 31.0% N by mass. What is its empirical formula? (Atomic masses: C = 12.0 g/mol, H = 1.0 g/mol, N = 14.0 g/mol)

Question 13

Which of the following is the correct name for $H_2SO_4$?

Accepted Answer

Sulfuric acid

Question 14

Which of the following is the correct formula for barium hydroxide?

Accepted Answer

$Ba(OH)_2$

Question 15

How many molecules are in 36.04 g of water ($H_2O$)? (Molar mass of $H_2O$ = 18.02 g/mol, Avogadro's number = $6.022 	imes 10^{23}$ molecules/mol)

Accepted Answer

$1.204 	imes 10^{24}$ molecules

Question 16

Which of the following is the correct empirical formula for pentene ($C_5H_{10}$)?

Accepted Answer

$CH_2$

Question 17

Which of the following is a correct statement about the structure of ionic compounds in the solid state?

Accepted Answer

Ions of opposite charge are arranged in a 3D lattice.

Question 18

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

Accepted Answer

Sodium chloride

Question 19

Which of the following is the correct formula for ammonium ion?

Accepted Answer

$NH_4^+$

Question 20

Which of the following is the correct name for $HClO_3$?

Accepted Answer

Chloric acid

Chapter 3: Molecules and Compounds – General Chemistry Study Notes

Study Guide - Practice Questions

Study Guide - Flashcards