$$\text{mass} = \text{mol} \times \text{molar mass}$$

Question 1

A medication contains aluminum hydroxide, Al(OH)$$_3. $$What is the molar mass of aluminum hydroxide?

Accepted Answer

78.01 g/mol

Question 2

Lithium carbonate (Li$$_2CO$_3) is $$used to treat bipolar disorder. What is the molar mass of lithium carbonate?

Accepted Answer

73.89 g/mol

Question 3

How many moles are present in 125 g of ammonium chloride (NH$$_4Cl$$, molar mass 53.50 g/mol)?

$$	ext{mol} = \frac{	ext{mass}}{	ext{molar mass}}$$

Accepted Answer

2.34 mol

Question 4

Calculate the mass in grams corresponding to 2.50 mol of ethane, C$$_2H$_6 ($$molar mass 30.08 g/mol).

$$	ext{mass} = 	ext{mol} 	imes 	ext{molar mass}$$

Accepted Answer

75.2 g

Question 5

A box of salt contains 737 g of NaCl. How many moles of NaCl are present in the box? (Molar mass NaCl = 58.44 g/mol)

$$	ext{mol} = \frac{	ext{mass}}{	ext{molar mass}}$$

Accepted Answer

12.6 mol

Question 6

Which of the following is evidence that a chemical reaction has occurred?

Accepted Answer

A gas is released when two solutions are mixed

Question 7

Which of the following best describes a combination reaction?

Accepted Answer

Two or more reactants combine to yield a single product

Question 8

A student weighed 0.550 g of lithium chloride (LiCl, molar mass 42.39 g/mol). How many moles is this?

$$	ext{mol} = \frac{	ext{mass}}{	ext{molar mass}}$$

Accepted Answer

0.0130 mol

Question 9

Calculate the molar mass of glucose, C$$_6H$_{12}O$_6.$$

Accepted Answer

180.18 g/mol

Question 10

Calculate the mass in grams corresponding to 0.100 mol of glucose (C$$_6H$_{12}O$_6$$, molar mass 180.18 g/mol).

$$	ext{mass} = 	ext{mol} 	imes 	ext{molar mass}$$

Accepted Answer

18.02 g

Question 11

Which of the following is the correct balanced equation for the reaction of calcium oxide with water to form calcium hydroxide?

Accepted Answer

CaO(s) + H$$_2O(l$$) $$\rightarrow Ca(OH$$)$$_2(aq)$$

Question 12

Which type of reaction is represented by the equation: 2HgO(s) $$\xrightarrow{\Delta} 2Hg(l) + O$_2(g$$)?

Accepted Answer

Decomposition

Question 13

Which of the following equations correctly relates mass, moles, and molar mass?

Accepted Answer

$$	ext{mass} = 	ext{mol} 	imes 	ext{molar mass}$$

Question 14

Which of the following is a double-replacement reaction?

Accepted Answer

AB + CD $$\rightarrow AD + CB$$

Question 15

A patient is prescribed 0.250 mol of lithium carbonate (Li$$_2CO$_3) $$per day. What is the mass in grams of this dose? (Molar mass = 73.89 g/mol)

$$	ext{mass} = 	ext{mol} 	imes 	ext{molar mass}$$

Accepted Answer

18.47 g

Question 16

Which of the following is NOT a sign that a chemical reaction has occurred?

Accepted Answer

A liquid evaporates at room temperature

Question 17

Which of the following best describes a single-replacement reaction?

Accepted Answer

One element replaces another in a compound

Question 18

A solution contains 0.100 mol of glucose (C$$_6H$_{12}O$_6). $$What is the mass of glucose in the solution? (Molar mass = 180.18 g/mol)

$$	ext{mass} = 	ext{mol} 	imes 	ext{molar mass}$$

Accepted Answer

18.02 g

Chemical Quantities and Reactions: Study Guide

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