Understanding the Relationship
* Molar Mass: The molar mass is the mass of one mole of a substance (6.022 x 10^23 atoms or molecules). It's expressed in grams per mole (g/mol).
* Atomic Mass: The atomic mass (also called atomic weight) is the average mass of an atom of an element, expressed in atomic mass units (amu).
The Connection
The key is that the numerical value of the molar mass in grams per mole is the *same* as the numerical value of the atomic mass in atomic mass units.
Example
* The molar mass of carbon is 12.01 g/mol.
* The atomic mass of carbon is 12.01 amu.
Finding the Mass of a Single Atom
To find the mass of a single atom, you need to convert from atomic mass units (amu) to grams:
1. Convert amu to grams: 1 amu = 1.66054 x 10^-24 grams
2. Multiply the atomic mass (in amu) by the conversion factor:
For example, the mass of a single carbon atom would be:
12.01 amu * (1.66054 x 10^-24 grams/amu) = 1.994 x 10^-23 grams
Important Note: The atomic mass is an average, taking into account the different isotopes of an element. So, the mass of a single atom may vary slightly depending on the specific isotope.
