Question 1

List the number of atoms of each element in a formula unit of ammonium sulfate.

Accepted Answer

A) 1 nitrogen atom, 4 hydrogen atoms, 1 sulfur atom, 4 oxygen atoms 
B) 1 nitrogen atom, 3 hydrogen atoms, 1 sulfur atom, 4 oxygen atoms 
C) 2 nitrogen atoms, 6 hydrogen atoms, 1 sulfur atom, 4 oxygen atoms 
D) 2 nitrogen atoms, 8 hydrogen atoms, 1 sulfur atom, 4 oxygen atoms 
E) 1 nitrogen atom, 4 hydrogen atoms, 2 sulfur atoms, 8 oxygen atoms 
A) 1 nitrogen atom, 4 hydrogen atoms, 1 sulfur atom, 4 oxygen atoms 
B) 1 nitrogen atom, 3 hydrogen atoms, 1 sulfur atom, 4 oxygen atoms 
C) 2 nitrogen atoms, 6 hydrogen atoms, 1 sulfur atom, 4 oxygen atoms 
D) 2 nitrogen atoms, 8 hydrogen atoms, 1 sulfur atom, 4 oxygen atoms 
E) 1 nitrogen atom, 4 hydrogen atoms, 2 sulfur atoms, 8 oxygen atoms D

Question 2

Consider the following molecule.The identity of the atoms are shown.   What is the molar mass of this substance?

Accepted Answer

A) 22.00 g/mol 
B) 56.02 g/mol 
C) 28.01 g/mol 
D) 76.01 g/mol 
E) 44.01 g/mol 
A) 22.00 g/mol 
B) 56.02 g/mol 
C) 28.01 g/mol 
D) 76.01 g/mol 
E) 44.01 g/mol E

Question 3

Calculate the molar mass of ammonium sulfide.

Accepted Answer

A) 68.15 g/mol 
B) 82.16 g/mol 
C) 49.10 g/mol 
D) 50.11 g/mol 
E) 66.14 g/mol 
A) 68.15 g/mol 
B) 82.16 g/mol 
C) 49.10 g/mol 
D) 50.11 g/mol 
E) 66.14 g/mol A

Question 4

Which of the following statements is/are correct?

Accepted Answer

A) Because it is the standard, carbon has a molar mass of exactly one gram per mole 
B) The phrase "molar mass of iodine" is not ambiguous, but the phrase "molar mass of potassium" is ambiguous 
C) The molar mass of a substance is the mass in grams of one mole of the substance 
D) The formula masses of ionic compounds are always larger, numerically, than the molar masses of those compounds 
E) None of the above is correct 
A) Because it is the standard, carbon has a molar mass of exactly one gram per mole 
B) The phrase "molar mass of iodine" is not ambiguous, but the phrase "molar mass of potassium" is ambiguous 
C) The molar mass of a substance is the mass in grams of one mole of the substance 
D) The formula masses of ionic compounds are always larger, numerically, than the molar masses of those compounds 
E) None of the above is correct

Question 5

How many moles are in 6.27 × 1024 formula units of sodium nitrate?

Accepted Answer

A) 0.0960 
B) 10.4 
C) 85.0 
D) 3.77 × 1048 
E) 2.65 × 10-49 
A) 0.0960 
B) 10.4 
C) 85.0 
D) 3.77 × 1048 
E) 2.65 × 10-49

Question 6

How many atoms are in 0.188 mol Na?

Accepted Answer

A) 3.12 × 10-25 
B) 8.84 × 10-24 
C) 1.13 × 1023 
D) 6.02 × 1023 
E) 3.20 × 1024 
A) 3.12 × 10-25 
B) 8.84 × 10-24 
C) 1.13 × 1023 
D) 6.02 × 1023 
E) 3.20 × 1024

Question 7

For which of the following compounds is the term formula mass better suited than the term molecular mass?
i.F2
ii.CaO
iii.NH3
iv.NaOH
v.CH3OH

Accepted Answer

A) ii only 
B) ii and iv 
C) i and iii 
D) ii, iv and v 
E) i, iii, and v 
A) ii only 
B) ii and iv 
C) i and iii 
D) ii, iv and v 
E) i, iii, and v

Question 8

The following two containers are found on a stock room counter.   How many atoms of nitrogen are in a formula unit of each from left to right,respectively?

Accepted Answer

A) 1 nitrogen atom, 1 nitrogen atom 
B) 1 nitrogen atom, 2 nitrogen atoms 
C) 2 nitrogen atoms, 1 nitrogen atoms 
D) 2 nitrogen atoms, 2 nitrogen atoms 
E) 3 nitrogen atoms, 6 nitrogen atoms 
A) 1 nitrogen atom, 1 nitrogen atom 
B) 1 nitrogen atom, 2 nitrogen atoms 
C) 2 nitrogen atoms, 1 nitrogen atoms 
D) 2 nitrogen atoms, 2 nitrogen atoms 
E) 3 nitrogen atoms, 6 nitrogen atoms

Question 9

Calculate the number of moles in 15.8 grams of aluminum hydroxide.

Accepted Answer

A) 1232 mol 
B) 727 mol 
C) 15.8 mol 
D) 0.343 mol 
E) 0.203 mol 
A) 1232 mol 
B) 727 mol 
C) 15.8 mol 
D) 0.343 mol 
E) 0.203 mol

Question 10

A coolant widely used in automobile engines is 38.7% carbon,9.7% hydrogen,and 51.6% oxygen.Calculate the empirical formula for the compound.

Accepted Answer

A) C3HO3 
B) C2H3O2 
C) C2H3O 
D) CH3O 
E) CHO 
A) C3HO3 
B) C2H3O2 
C) C2H3O 
D) CH3O 
E) CHO

Question 11

Which off the following provides the conversion factor to convert 10.7 g of sulfur dioxide to the corresponding number of moles of sulfur dioxide?

Accepted Answer

A) molar mass 
B) molecular mass 
C) formula mass 
D) Avogadro's number 
E) either a or c 
A) molar mass 
B) molecular mass 
C) formula mass 
D) Avogadro's number 
E) either a or c

Question 12

A researcher finds that a compound is composed of 43.6% phosphorus and 56.4% oxygen.In a separate analysis,she finds that it has a molar mass of 142 g/mol.What is the molecular formula of the compound?

Accepted Answer

A) P4O10 
B) P3O7 
C) PO2 
D) PO 
E) P2O5 
A) P4O10 
B) P3O7 
C) PO2 
D) PO 
E) P2O5

Question 13

Consider the following laboratory chemical.   What is the molecular mass of this substance?

Accepted Answer

A) 31.02 u 
B) 63.02 u 
C) 47.02 u 
D) 126.04 u 
E) 110.01 u 
A) 31.02 u 
B) 63.02 u 
C) 47.02 u 
D) 126.04 u 
E) 110.01 u

Question 14

Which of the following statements is/are correct?
i.A mole of sodium atoms (atomic mass = 23.0 u)contains fewer atoms than a mole of potassium atoms (atomic mass = 39.1 u)
ii.A mole of sodium atoms (atomic mass = 23.0 u)contains more atoms than a mole of potassium atoms (atomic mass = 39.1 u)
iii.In effect,the word mole represents the number 6.02 × 1023
iv.One mole of a substance contains as many particles as there are atoms in 12 grams of carbon-12
v.One mole of molecular nitrogen contains as many molecules as 24.0 u of carbon-12

Accepted Answer

A) i and iii 
B) ii and iii 
C) i and iv 
D) iii and iv 
E) ii, iii, iv, and v 
A) i and iii 
B) ii and iii 
C) i and iv 
D) iii and iv 
E) ii, iii, iv, and v

Question 15

How many molecules are in 0.105 mol NH3?

Accepted Answer

A) 6.32 × 1022 
B) 5.73 × 1024 
C) 1.74 × 10-25 
D) 1.58 × 10-23 
E) 1.79 
A) 6.32 × 1022 
B) 5.73 × 1024 
C) 1.74 × 10-25 
D) 1.58 × 10-23 
E) 1.79

Question 16

Which of the following statements is/are correct?
i.The molar mass of carbon-12 is exactly 12 g.
ii.The phrase "molar mass of chlorine" is ambiguous.
iii.The molar mass of a substance is the mass in grams of 6.02 × 10²³ particles of that substance.
iv.For atoms,molar mass is numerically equal to atomic mass.
v.The molar masses of elements are always greater,numerically,than the atomic masses of those elements.

Accepted Answer

A) i only 
B) i and ii 
C) i,iii and iv 
D) i and v 
E) ii and v 
A) i only 
B) i and ii 
C) i,iii and iv 
D) i and v 
E) ii and v

Question 17

From the following,pick those that are not empirical formulas.
i.C2H8
ii.C2H3
iii.C6H6
iv.C7H6
v.C7H21

Accepted Answer

A) i and ii 
B) ii and iv 
C) iv and v 
D) i, iii, and v 
E) i, ii, and iii 
A) i and ii 
B) ii and iv 
C) iv and v 
D) i, iii, and v 
E) i, ii, and iii

Question 18

Calculate the formula mass of magnesium phosphate.

Accepted Answer

A) 119.28 u 
B) 143.59 u 
C) 214.25 u 
D) 262.87 u 
E) 333.53 u 
A) 119.28 u 
B) 143.59 u 
C) 214.25 u 
D) 262.87 u 
E) 333.53 u

Question 19

Calculate the percent nitrogen in ammonium nitrate.

Accepted Answer

A) 17.5% 
B) 21.9% 
C) 22.9% 
D) 33.3% 
E) 35.0% 
A) 17.5% 
B) 21.9% 
C) 22.9% 
D) 33.3% 
E) 35.0%

Question 20

Examine the following molecule.The component atoms are labeled.   What is the empirical formula for this substance?

Accepted Answer

A) SbCl2 
B) SbCl3 
C) Sb2Cl6 
D) SbCl 
E) Sb2Cl 
A) SbCl2 
B) SbCl3 
C) Sb2Cl6 
D) SbCl 
E) Sb2Cl

List the number of atoms of each element in a formula unit of ammonium sulfate.

Consider the following molecule.The identity of the atoms are shown. What is the molar mass of this substance?

Calculate the molar mass of ammonium sulfide.

Which of the following statements is/are correct?

How many moles are in 6.27 × 10²⁴ formula units of sodium nitrate?

How many atoms are in 0.188 mol Na?

For which of the following compounds is the term formula mass better suited than the term molecular mass? i.F₂ ii.CaO iii.NH₃ iv.NaOH v.CH₃OH

The following two containers are found on a stock room counter. How many atoms of nitrogen are in a formula unit of each from left to right,respectively?

Calculate the number of moles in 15.8 grams of aluminum hydroxide.

A coolant widely used in automobile engines is 38.7% carbon,9.7% hydrogen,and 51.6% oxygen.Calculate the empirical formula for the compound.

Which off the following provides the conversion factor to convert 10.7 g of sulfur dioxide to the corresponding number of moles of sulfur dioxide?

A researcher finds that a compound is composed of 43.6% phosphorus and 56.4% oxygen.In a separate analysis,she finds that it has a molar mass of 142 g/mol.What is the molecular formula of the compound?

Consider the following laboratory chemical. What is the molecular mass of this substance?

How many molecules are in 0.105 mol NH₃?

From the following,pick those that are not empirical formulas. i.C₂H₈ ii.C₂H₃ iii.C₆H₆ iv.C₇H₆ v.C₇H₂₁

Calculate the formula mass of magnesium phosphate.

Calculate the percent nitrogen in ammonium nitrate.

Examine the following molecule.The component atoms are labeled. What is the empirical formula for this substance?

Matter and Energy

Measurement and Chemical Calculations

Introduction to Gases

Atomic Theory: The Nuclear Model of the Atom

Chemical Nomenclature

Chemical Reactions

Chemical Change

Quantity Relationships in Chemical Reactions

Atomic Theory: The Quantum Model of the Atom

Chemical Bonding

Structure and Shape

The Ideal Gas Law and Its Applications

Gases, Liquids, and Solids

Solutions

Acidbase Proton Transferreactions

Chemical Equilibrium

Oxidationreduction Electron Transferreactions

Nuclear Chemistry

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Exam 7: Chemical Formula Relationships

List the number of atoms of each element in a formula unit of ammonium sulfate.

Consider the following molecule.The identity of the atoms are shown. What is the molar mass of this substance?

Calculate the molar mass of ammonium sulfide.

Which of the following statements is/are correct?

How many moles are in 6.27 × 1024 formula units of sodium nitrate?

How many atoms are in 0.188 mol Na?

For which of the following compounds is the term formula mass better suited than the term molecular mass? i.F2 ii.CaO iii.NH3 iv.NaOH v.CH3OH

The following two containers are found on a stock room counter. How many atoms of nitrogen are in a formula unit of each from left to right,respectively?

Calculate the number of moles in 15.8 grams of aluminum hydroxide.

A coolant widely used in automobile engines is 38.7% carbon,9.7% hydrogen,and 51.6% oxygen.Calculate the empirical formula for the compound.

Which off the following provides the conversion factor to convert 10.7 g of sulfur dioxide to the corresponding number of moles of sulfur dioxide?

A researcher finds that a compound is composed of 43.6% phosphorus and 56.4% oxygen.In a separate analysis,she finds that it has a molar mass of 142 g/mol.What is the molecular formula of the compound?

Consider the following laboratory chemical. What is the molecular mass of this substance?

How many molecules are in 0.105 mol NH3?

From the following,pick those that are not empirical formulas. i.C2H8 ii.C2H3 iii.C6H6 iv.C7H6 v.C7H21

Calculate the formula mass of magnesium phosphate.

Calculate the percent nitrogen in ammonium nitrate.

Examine the following molecule.The component atoms are labeled. What is the empirical formula for this substance?

Matter and Energy

Measurement and Chemical Calculations

Introduction to Gases

Atomic Theory: The Nuclear Model of the Atom

Chemical Nomenclature

Chemical Reactions

Chemical Change

Quantity Relationships in Chemical Reactions

Atomic Theory: The Quantum Model of the Atom

Chemical Bonding

Structure and Shape

The Ideal Gas Law and Its Applications

Gases, Liquids, and Solids

Solutions

Acidbase Proton Transferreactions

Chemical Equilibrium

Oxidationreduction Electron Transferreactions

Nuclear Chemistry

Organic Chemistry

Biochemistry

Filters

How many moles are in 6.27 × 10²⁴ formula units of sodium nitrate?

For which of the following compounds is the term formula mass better suited than the term molecular mass? i.F₂ ii.CaO iii.NH₃ iv.NaOH v.CH₃OH

How many molecules are in 0.105 mol NH₃?

From the following,pick those that are not empirical formulas. i.C₂H₈ ii.C₂H₃ iii.C₆H₆ iv.C₇H₆ v.C₇H₂₁