Using Molar Mass to Count Molecules by Weighing

Using Molar Mass to Count Molecules by Weighing 

The molar mass of CO2 is a conversion factor between mass (in grams) and amount (in moles) of CO2. Suppose we want to find the number of CO2 molecules in a sample of dry ice (solid CO2) with a mass of 10.8 g. This calculation is analogous to Example 2.8, where we found the number of atoms in a sample of copper of a given mass. We begin with the 

To solve the problem, we follow the conceptual plan, beginning with 10.8 g CO2, converting to moles, and then to molecules. 

EXAMPLE 3.13 The Mole Concept—Converting between Mass and Number of Molecules 

An aspirin tablet contains 325 mg of acetylsalicylic acid (C9Hg04 . How many acetylsalicylic acid molecules does it contain  

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