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Chem 103: Module 4 Questions and
Correct Answers/ Latest Update / Already
Graded
Avogadro's number
Ans: 6.022 x 10^23 atoms = 1 mole
1 u = ___ g
Ans: 1.661 x 10 ^-24 g
formula mass
Ans: 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 substance is defined by
Ans: the types and relative numbers of atoms composing its
fundamental entities (molecules in the case of covalent
compounds, ions in the case of ionic compounds).
All rights reserved © 2025/ 2026 |
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A compound's percent composition provides
Ans: the mass percentage of each element in the compound.
calculate the formula mass of a substance by
Ans: summing the average atomic masses of all the atoms
represented in the substance's formula.
A mole is defined as
Ans: 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
Ans: the percentage by mass of each element in a compound
i.e. mass X / mass compound x 100%
stoichiometry
Ans: refers to the quantitative relationships between amounts
of reactants and products in a chemical reaction.
Combustion
All rights reserved © 2025/ 2026 |
Chem 103: Module 4 Questions and
Correct Answers/ Latest Update / Already
Graded
Avogadro's number
Ans: 6.022 x 10^23 atoms = 1 mole
1 u = ___ g
Ans: 1.661 x 10 ^-24 g
formula mass
Ans: 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 substance is defined by
Ans: the types and relative numbers of atoms composing its
fundamental entities (molecules in the case of covalent
compounds, ions in the case of ionic compounds).
All rights reserved © 2025/ 2026 |
, Page |2
A compound's percent composition provides
Ans: the mass percentage of each element in the compound.
calculate the formula mass of a substance by
Ans: summing the average atomic masses of all the atoms
represented in the substance's formula.
A mole is defined as
Ans: 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
Ans: the percentage by mass of each element in a compound
i.e. mass X / mass compound x 100%
stoichiometry
Ans: refers to the quantitative relationships between amounts
of reactants and products in a chemical reaction.
Combustion
All rights reserved © 2025/ 2026 |
