Chem 103:module 4 exam With CorreCt aCtual Questions and
CorreCtly Well defined ansWers latest already Graded a+
2025 – 2026
Combustion analysis can be used to - CORRECT ANSWER-identify an unknown hydrocarbon
because the identity of the products are known to be CO2 and H2O.
Empirical formulas are derived from experimentally measured element masses by - CORRECT
ANSWER---Deriving the number of moles of each element from its mass
--Dividing each element's molar amount by the smallest molar amount to yield subscripts for a
tentative empirical formula
--Multiplying all coefficients by an integer, if necessary, to ensure that the smallest whole-
number ratio of subscripts is obtained
Empirical formula - CORRECT ANSWER-a formula with the lowest whole-number ratio of
elements in a compound
Avogadro's number - CORRECT ANSWER-6.022 x 10^23 atoms = 1 mole
1 u = ___ g - CORRECT ANSWER-1.661 x 10 ^-24 g
formula mass - CORRECT ANSWER-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.
CorreCtly Well defined ansWers latest already Graded a+
2025 – 2026
Combustion analysis can be used to - CORRECT ANSWER-identify an unknown hydrocarbon
because the identity of the products are known to be CO2 and H2O.
Empirical formulas are derived from experimentally measured element masses by - CORRECT
ANSWER---Deriving the number of moles of each element from its mass
--Dividing each element's molar amount by the smallest molar amount to yield subscripts for a
tentative empirical formula
--Multiplying all coefficients by an integer, if necessary, to ensure that the smallest whole-
number ratio of subscripts is obtained
Empirical formula - CORRECT ANSWER-a formula with the lowest whole-number ratio of
elements in a compound
Avogadro's number - CORRECT ANSWER-6.022 x 10^23 atoms = 1 mole
1 u = ___ g - CORRECT ANSWER-1.661 x 10 ^-24 g
formula mass - CORRECT ANSWER-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.
