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mass
'no magic to the mole'
amount
molar mass
concentration
solution volume
gas volume
molar gas volume
Avogadro
constant, L
number of
entities, N
Now try the following question.
MOLECULAR FORMULA – gives the atomic symbols of the atoms present in one molecule of a substance and with the number(s) of these atoms being implied by integer sub-scripts in the written formula.
11.4 MOLECULAR FORMULA FROM EMPIRICAL FORMULA & MOLAR MASS
To determine the molecular formula of a compound we need to know not only its empirical formula but also its molar mass or relative molecular mass. Molar mass can be determined experimentaly for volatile substances from measurements of mass and volume using routine methods.
Use of empirical formula and molar mass to determine molecular formula is illustrated by way
of a simple Worked Example.
WORKED EXAMPLE 13
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