Question 1

How many atoms of each element are in a formula unit of magnesium phosphate?

Accepted Answer

A) 3 magnesium atoms, 2 phosphorus atoms, 8 oxygen atoms 
B) 2 magnesium atoms, 3 phosphorus atoms, 12 oxygen atoms 
C) 1 magnesium atom, 1 phosphorus atom, 4 oxygen atoms 
D) 2 magnesium atoms, 1 phosphorus atom, 4 oxygen atoms 
E) 1 magnesium atom, 2 phosphorus atoms, 8 oxygen atoms 
A) 3 magnesium atoms, 2 phosphorus atoms, 8 oxygen atoms 
B) 2 magnesium atoms, 3 phosphorus atoms, 12 oxygen atoms 
C) 1 magnesium atom, 1 phosphorus atom, 4 oxygen atoms 
D) 2 magnesium atoms, 1 phosphorus atom, 4 oxygen atoms 
E) 1 magnesium atom, 2 phosphorus atoms, 8 oxygen atoms

Question 2

A certain compound is 66.7% carbon,3.74% hydrogen,and 29.6% oxygen.Find the empirical formula.

Accepted Answer

A) C3H2O 
B) C3HO 
C) CHO 
D) CH2O 
E) CH3O3 
A) C3H2O 
B) C3HO 
C) CHO 
D) CH2O 
E) CH3O3

Question 3

Which of the following is the best definition of atomic mass?

Accepted Answer

A) The average mass of the atoms of an element compared to the mass of an atom of carbon-12 at exactly 12 atomic mass units 
B) A property reflecting the quantity of matter in a sample 
C) The mass of an atom measured in the SI unit of mass, the kilogram 
D) The number of grams in a mole of a substance 
E) The mass of the number of carbon atoms in exactly 12 grams of carbon-12 
A) The average mass of the atoms of an element compared to the mass of an atom of carbon-12 at exactly 12 atomic mass units 
B) A property reflecting the quantity of matter in a sample 
C) The mass of an atom measured in the SI unit of mass, the kilogram 
D) The number of grams in a mole of a substance 
E) The mass of the number of carbon atoms in exactly 12 grams of carbon-12

Question 4

A compound is analyzed and found to contain 0.279 g C,0.0469 g H,and 0.124 g O.Its molecular mass is 116 g/mol.What is its molecular formula?

Accepted Answer

A) C5H8O3 
B) C3H6O 
C) C6H12O2 
D) CH6O2 
E) C2H12O4 
A) C5H8O3 
B) C3H6O 
C) C6H12O2 
D) CH6O2 
E) C2H12O4

Question 5

How many grams of oxygen are in 8.50 g of formaldehyde,CH2O?

Accepted Answer

A) 2.12 g 
B) 2.83 g 
C) 4.25 g 
D) 4.53 g 
E) 16.0 g 
A) 2.12 g 
B) 2.83 g 
C) 4.25 g 
D) 4.53 g 
E) 16.0 g

How many atoms of each element are in a formula unit of magnesium phosphate?

A certain compound is 66.7% carbon,3.74% hydrogen,and 29.6% oxygen.Find the empirical formula.

Which of the following is the best definition of atomic mass?

A compound is analyzed and found to contain 0.279 g C,0.0469 g H,and 0.124 g O.Its molecular mass is 116 g/mol.What is its molecular formula?

How many grams of oxygen are in 8.50 g of formaldehyde,CH₂O?

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

Exam 7: Chemical Formula Relationships

How many atoms of each element are in a formula unit of magnesium phosphate?

A certain compound is 66.7% carbon,3.74% hydrogen,and 29.6% oxygen.Find the empirical formula.

Which of the following is the best definition of atomic mass?

A compound is analyzed and found to contain 0.279 g C,0.0469 g H,and 0.124 g O.Its molecular mass is 116 g/mol.What is its molecular formula?

How many grams of oxygen are in 8.50 g of formaldehyde,CH2O?

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 grams of oxygen are in 8.50 g of formaldehyde,CH₂O?