Concept explainers
Pain Relief Acetaminophen, a common aspirin substitute, has the formula
Interpretation:
The number of molecules of acetaminophen present in 500 mg tablet should be calculated.
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 Avogadro number, i.e.,
Answer to Problem 148A
Number of molecules of acetaminophen =
Explanation of Solution
Mass of tablet = 500 mg
Convert the mass in mg to g.
Since, 1 g = 1000 mg
Thus, the mass of tablet in g =
=
Molecular formula of acetaminophen =
Molar mass of
=
=
Number of moles of
=
Number of molecules of acetaminophen =
Number of molecules of acetaminophen =
=
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