General Chemistry Stoichiometry (Final
Exam) – Study Guide, Practice Questions
with Answers and Key Concepts
Introduction:
This document covers key concepts in general chemistry
stoichiometry, including moles, molar mass, empirical and
molecular formulas, limiting reactants, and percent yield. It also
includes worked examples, practice questions with precise
answers, and step-by-step calculations for common exam problems.
Additionally, the guide reviews solution chemistry topics such as
titrations, dilution equations, and acid-base reactions, making it a
comprehensive final exam preparation resource.
Exam Questions and Answers:
As a general rule of thumb for isoelectronic species, anions have the
largest ---Correct precise answer---radii.
Electrons aren't pulled close to the nucleus
Zn has an oxidation potential of +0.76, while Al has an oxidation
potential of +1.66. Which metal serves as the better oxidizing
,agent? ---Correct precise answer---Zn2+, because it is more prone
to gaining electrons
Zn2+ has a reduction potential of -0.76
Al has a reduction potential of -1.66.
Zn2+ is the better choice for an oxidizing agent.
How to get the moles of a compound? ---Correct precise answer---
grams of compound divided by the molecular weight of the
compound.
g/molecular mass = moles
One mole of copper has a mass of 63.5 grams. Approximately how
many atoms of copper are present in one mole of copper? ---Correct
precise answer---6 × 10^23 atoms
Which of the following best defines one mole of a substance? ---
Correct precise answer---Amount of substance present in
Avogadro's number of particles of the substance
How many atoms of Mg are present in 97.22 grams of Mg? ---
Correct precise answer---2.408 × 10^24
, Which formula can be used to calculate the molar mass of water
(H2O)? ---Correct precise answer---2 × molar mass of H + molar
mass of O
How many moles of MgCO3 are present in 252.939 grams of
MgCO3? ---Correct precise answer---3
Which pair of compounds has the same empirical formula? ---
Correct precise answer---CH3 and C2H6
What is the percentage composition of each element in dinitrogen
monoxide, N2O? (5 points) ---Correct precise answer---63.64% N;
36.36% O
Determine the empirical formula of a compound containing 48.38
grams of carbon, 6.74 grams of hydrogen, and 53.5 grams of
oxygen.
In an experiment, the molar mass of the compound was determined
to be 180.15 g/mol. What is the molecular formula of the
compound?
For both questions, show your work or explain how you determined
the formulas by giving specific values used in calculations. ---
Exam) – Study Guide, Practice Questions
with Answers and Key Concepts
Introduction:
This document covers key concepts in general chemistry
stoichiometry, including moles, molar mass, empirical and
molecular formulas, limiting reactants, and percent yield. It also
includes worked examples, practice questions with precise
answers, and step-by-step calculations for common exam problems.
Additionally, the guide reviews solution chemistry topics such as
titrations, dilution equations, and acid-base reactions, making it a
comprehensive final exam preparation resource.
Exam Questions and Answers:
As a general rule of thumb for isoelectronic species, anions have the
largest ---Correct precise answer---radii.
Electrons aren't pulled close to the nucleus
Zn has an oxidation potential of +0.76, while Al has an oxidation
potential of +1.66. Which metal serves as the better oxidizing
,agent? ---Correct precise answer---Zn2+, because it is more prone
to gaining electrons
Zn2+ has a reduction potential of -0.76
Al has a reduction potential of -1.66.
Zn2+ is the better choice for an oxidizing agent.
How to get the moles of a compound? ---Correct precise answer---
grams of compound divided by the molecular weight of the
compound.
g/molecular mass = moles
One mole of copper has a mass of 63.5 grams. Approximately how
many atoms of copper are present in one mole of copper? ---Correct
precise answer---6 × 10^23 atoms
Which of the following best defines one mole of a substance? ---
Correct precise answer---Amount of substance present in
Avogadro's number of particles of the substance
How many atoms of Mg are present in 97.22 grams of Mg? ---
Correct precise answer---2.408 × 10^24
, Which formula can be used to calculate the molar mass of water
(H2O)? ---Correct precise answer---2 × molar mass of H + molar
mass of O
How many moles of MgCO3 are present in 252.939 grams of
MgCO3? ---Correct precise answer---3
Which pair of compounds has the same empirical formula? ---
Correct precise answer---CH3 and C2H6
What is the percentage composition of each element in dinitrogen
monoxide, N2O? (5 points) ---Correct precise answer---63.64% N;
36.36% O
Determine the empirical formula of a compound containing 48.38
grams of carbon, 6.74 grams of hydrogen, and 53.5 grams of
oxygen.
In an experiment, the molar mass of the compound was determined
to be 180.15 g/mol. What is the molecular formula of the
compound?
For both questions, show your work or explain how you determined
the formulas by giving specific values used in calculations. ---
