Chem 103: Module 4 EXAM, || Questions and Answers
(Verified Answers) Complete Test (Latest Update
2026/2027) UPDATE!!
Avogadro's number 6.022 x 10^23 atoms = 1 mole
1 u = ___ g 1.661 x 10 ^-24 g
formula mass the sum of the average atomic masses
of each atom represented in the
chemical formula and is expressed in
atomic mass units.
--The formula mass of a covalent
compound is also called the molecular
mass.
The chemical identity of a the types and relative numbers of atoms
substance is defined by composing its fundamental entities
(molecules in the case of covalent
compounds, ions in the case of ionic
compounds).
A compound's percent the mass percentage of each element in
composition provides the compound.
calculate the formula mass summing the average atomic masses of
, of a substance by all the atoms represented in the
substance's formula.
A mole is defined as the amount of substance containing the
same number of discrete entities (such as
atoms, molecules, and ions) as the
number of atoms in a sample of pure 12-
C
weighing exactly 12 g
percent composition the percentage by mass of each element
in a compound
i.e. mass X / mass compound x 100%
stoichiometry refers to the quantitative relationships
between amounts of reactants and
products in a chemical reaction.
Combustion a reaction in which an element or
compound burns in air or oxygen
--The combustion of compounds
containing hydrogen and carbon
(CxHy) will always produce two
products: water (H2O) and carbon
dioxide (CO2).
--The same is true for the
combustion of compounds
containing hydrogen, carbon and
oxygen (CxHyOz)
(Verified Answers) Complete Test (Latest Update
2026/2027) UPDATE!!
Avogadro's number 6.022 x 10^23 atoms = 1 mole
1 u = ___ g 1.661 x 10 ^-24 g
formula mass the sum of the average atomic masses
of each atom represented in the
chemical formula and is expressed in
atomic mass units.
--The formula mass of a covalent
compound is also called the molecular
mass.
The chemical identity of a the types and relative numbers of atoms
substance is defined by composing its fundamental entities
(molecules in the case of covalent
compounds, ions in the case of ionic
compounds).
A compound's percent the mass percentage of each element in
composition provides the compound.
calculate the formula mass summing the average atomic masses of
, of a substance by all the atoms represented in the
substance's formula.
A mole is defined as the amount of substance containing the
same number of discrete entities (such as
atoms, molecules, and ions) as the
number of atoms in a sample of pure 12-
C
weighing exactly 12 g
percent composition the percentage by mass of each element
in a compound
i.e. mass X / mass compound x 100%
stoichiometry refers to the quantitative relationships
between amounts of reactants and
products in a chemical reaction.
Combustion a reaction in which an element or
compound burns in air or oxygen
--The combustion of compounds
containing hydrogen and carbon
(CxHy) will always produce two
products: water (H2O) and carbon
dioxide (CO2).
--The same is true for the
combustion of compounds
containing hydrogen, carbon and
oxygen (CxHyOz)
