Concept explainers
Interpretation:
The number of molecules of acetic acid should be determined which is present in 25.0 g of vinegar.
Concept introduction:
The number of moles of a compound is defined as the ratio of the given mass of the compound to the molar or molecular mass of the compound.
The mathematical expression is given by:
Number of moles =
The one mole of any substance is equal to the
Answer to Problem 145A
Number of molecules of acetic acid =
Explanation of Solution
It is given that; vinegar contains 5.0 % of acetic acid.
The molecular formula of acetic acid =
The molar mass of
=
Mass of acetic acid =
=
Number of moles of acetic acid =
Number of moles of acetic acid =
=
Since, one mole of any substance is equal to the Avogadro number, i.e.,
Number of molecules of acetic acid =
Number of molecules of acetic acid =
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