Ernie's Page: Problems-On-The-Fly

Problem Answer

The larger number of mole corresponds to the larger number of atoms. In this case, moles of manganese = 0.923 and moles of oxygen = 0.875, thus there are more atoms of manganese.

By way of example, moles of manganese = (50.7 g)*(1.00 mole/54.9 g) or 0.923.

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Comparing Atom Count

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Background

The mole concept is a convenient mathematics construct that follows logically from the atomic theory. At the most basic level, moles can be used for comparing relative numbers of atoms or molecules. Answering the question below involves a simple conversion of grams into moles for each element. Textbook Discussion: Section 5.7, page 119. See Also: Example IV, page 121; Example V, page 122; and Example XII, page 128.

Problem

Which of the following element samples contains the greater number of atoms? Atomic Masses: Mn=54.9 O=16.0 amu.

50.7grams of manganese
14.0grams of oxygen

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Comparing Atom Count

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"Will you walk into my parlour?" said the Spider to the Fly,
"'Tis the prettiest little parlour that ever you did spy..."
Mary Howitt-1834

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Comparing Atom Count

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"Will you walk into my parlour?" said the Spider to the Fly,"'Tis the prettiest little parlour that ever you did spy..."Mary Howitt-1834

"Will you walk into my parlour?" said the Spider to the Fly,
"'Tis the prettiest little parlour that ever you did spy..."
Mary Howitt-1834