CHEMISTRY CHAPTER 3

Exercise 3.28: Problems by Topic – Chemical Formulas and Molecular View of Elements and Compounds

Part A

Which of the following elements have molecules as their basic units?

Check all that apply.

[removed]fluorine

[removed]lead

[removed]nitrogen

[removed]bromine

 

Exercise 3.30: Problems by Topic – Chemical Formulas and Molecular View of Elements and Compounds

Classify each of the following compounds as ionic or molecular.

Part A

CF 2 Cl 2

[removed]molecular

[removed]ionic

Part B

CO

[removed]ionic

[removed]molecular

Part C

ClO 2

[removed]ionic

[removed]molecular

Part D

NI 3

[removed]molecular

[removed]ionic

 

Exercise 3.34: Problems by Topic – Formulas and Names for Ionic Compounds

Write a formula for the ionic compound that forms between each of the following pairs of elements.

Part A

caesium and chlorine

Express your answer as a chemical formula.

 

Part B

aluminum and nitrogen

Express your answer as a chemical formula.

 

Part C

sodium and oxygen

Express your answer as a chemical formula.

 

Part D

barium and bromine

Express your answer as a chemical formula.

 

 

Exercise 3.46: Problems by Topic – Formulas and Names for Ionic Compounds

Write a formula for each of the following ionic compounds.

Part A

lead(II) chloride

Express your answer as a chemical formula.

 

Part B

iron(II) iodate

Express your answer as a chemical formula.

 

Part C

potassium chromate

Express your answer as a chemical formula.

 

Part D

potassium fluoride

Express your answer as a chemical formula.

 

Part E

iron(III) hydroxide

Express your answer as a chemical formula.

 

Part F

calcium phosphate

Express your answer as a chemical formula.

 

 

Exercise 3.58: Problems by Topic – Formula Mass and the Mole Concept for Compounds

Calculate the formula mass for each of the following compounds.

Part A

MgBr 2

Express your answer using two decimal places.

formula mass = 

 

 

Part B

H 3 PO 4

Express your answer using two decimal places.

formula mass = 

 

 

Part C

CBr 4

Express your answer using two decimal places.

formula mass = 

 

 

Part D

FeCl 2

Express your answer using two decimal places.

formula mass = 

 

 

 

Exercise 3.66: Problems by Topic – Composition of Compounds

Calculate the mass percent composition of nitrogen in each of the following nitrogen compounds.

Part A

N 2 O 5

Express your answer using four significant figures.

mass %N = 

 

 

Part B

Si 3 N 4

Express your answer using four significant figures.

mass %N = 

 

 

Part C

NO 2

Express your answer using four significant figures.

mass %N = 

 

 

Part D

HNO 3

Express your answer using four significant figures.

mass %N = 

 

 

 

Exercise 3.72: Problems by Topic – Composition of Compounds

The American Dental Association recommends that an adult female should consume 3.0 mg of fluoride ( F − ) per day to prevent tooth decay.

Part A

If the fluoride is consumed as sodium fluoride (45.24% F ), what amount of sodium fluoride contains the recommended amount of fluoride?

Express your answer using two significant figures.

m = 

 

 

 

Exercise 3.80: Problems by Topic – Chemical Formulas from Experimental Data

Samples of several compounds are decomposed and the masses of their constituent elements are shown below. Calculate the empirical formula for each compound.

Part A

1.245 g Ni , 5.381 gI

Express your answer as a chemical formula.

 

 

Part B

2.677 gBa , 1.382 g Cl

Express your answer as a chemical formula.

 

Part C

14.980 g Cu , 7.557 gS , 15.107 gO

Express your answer as a chemical formula.

 

 

Exercise 3.86: Problems by Topic – Chemical Formulas from Experimental Data

The molar mass and empirical formula of several compounds are listed below. Find the molecular formula of each compound.

Part A

C 4 H 9 , 114.27 g/mol

Express your answer as a chemical formula.

 

Part B

CCl , 189.82 g/mol

Express your answer as a chemical formula.

 

Part C

C 3 H 2 N , 208.25 g/mol

Express your answer as a chemical formula.

 

 

Exercise 3.94: Problems by Topic – Writing and Balancing Chemical Equations

When iron rusts, solid iron reacts with gaseous oxygen to form solid iron(III) oxide.

Part A

Write a balanced chemical equation for this reaction.

Express your answer as a chemical equation. Identify all of the phases in your answer.

 

 

Exercise 3.119: Cumulative Problems

Combustion analysis of a 13.42- g sample of estradiol (which contains only carbon, hydrogen, and oxygen) produced 39.01 g CO 2 and 10.65 g H 2 O . The molar mass of estradiol is 272.38 g/mol .

Part A

Find the molecular formula for estradiol.

Express your answer as a chemical formula.

 

 

Exercise 3.60: Problems by Topic – Formula Mass and the Mole Concept for Compounds

Calculate the mass (in g ) of each of the following.

Part A

5.59×1020 SO 3 molecules

m 1 = 

 

 

Part B

2.4×1022 H 2 O molecules

Express your answer using two significant figures.

m 2 = 

 

 

Part C

4.8×1025 O 3 molecules

Express your answer using two significant figures.

m 3 = 

 

 

Part D

9.77×1019 CCl 2 F 2 molecules

m 4 = 

 

 

 

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