Concept explainers
Interpretation:
The number of moles of each element present in caffeine should be determined.
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 151A
Number of moles of carbon in
Number of moles of hydrogen in
Number of moles of nitrogen in
Number of moles of oxygen in
Explanation of Solution
Molecular formula of caffeine =
Molar mass of
=
=
Mass of caffeine =
Convert the mass in mg to g.
Since, 1 g = 1000 mg
Thus, the mass of caffeine in g =
=
Number of moles of
=
Number of moles of carbon in
=
Number of moles of hydrogen in
=
Number of moles of nitrogen in
=
Number of moles of oxygen in
=
Chapter 10 Solutions
Glencoe Chemistry: Matter and Change, Student Edition
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