Barron's Chemistry Practice Plus by Mark Kernion

Author:Mark Kernion
Language: eng
Format: epub
Publisher: Barrons Educational Services
Published: 2022-06-07T00:00:00+00:00

Molar mass and molar volume are typically used as conversion factors to change quantities of reactants expressed as masses or as volumes to moles for use in stoichiometry problems via dimensional analysis.

EXAMPLE

Find the number of moles of silicon present in 4.30 g of silicon.

Recall that silicon is an element that is not diatomic. It has a molar mass of 28.1 g. So 28.1 g of silicon contains 1.00 mol of silicon atoms if significant figures are kept in mind.

Use dimensional analysis:

Note that when using dimensional analysis, the given quantity is simply multiplied by a factor that is equal to the value 1 since the numerator and denominator in that factor are equal to each other. Using this method causes the magnitude of the given quantity not to change. What does change is the unit in which the quantity is expressed. The given units cancel out, leaving only the unit in the numerator of the factor to describe the quantity.

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