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•Molar Mass and Moles

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Prozac, C17H18F3NO, is an antidepressant that inhibits the uptake of serotonin by the brain. What is the molar mass of Prozac?

1) 40.1 g/mole2) 262 g/mole 3) 309 g/mole

Learning Check

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Prozac, C17H18F3NO, is an antidepressant that inhibits the uptake of serotonin by the brain. What is the molar mass of Prozac?

3) 309 g/mole

17 C (12.0) + 18 H (1.01) + 3 F (19.0)

+ 1 N (14.0) + 1 O (16.0) =

204 + 18.2 + 57.0 + 14.0 + 16.0 = 309 g/mole

Solution

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Molar mass factors are used to convert between the mass (grams) of a substance and the number of moles.

Calculations Using Molar Mass

MolesX

÷

Molar Mass

Mass

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Aluminum is often used to build lightweight bicycleframes. How many grams of Al are in 3.00 mole Al?

Moles to Grams

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Learning Check

Allyl sulfide C6H10S is a compound that has the odor of garlic. How many moles of C6H10S are in 225 g?

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Grams, Moles, and Particles

A molar mass and Avogadro’s number convert• grams to particles.

molar mass Avogadro’s number g mole particles

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Learning Check

How many H2O molecules are in 24.0 g H2O?

1) 4.52 x 1023

2) 1.44 x 1025

3) 8.03 x 1023

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Learning Check

If the odor of C6H10S can be detected from 2 x 10-13 g in one liter of air, how many molecules of C6H10S are present?