CHEM 111 Chapter Notes - Chapter 7: Molar Mass, Formula Unit, Chemical Formula

• School: Drexel University
• Department: Chemistry
• Course: CHEM 111
• Professor: Wambsgans Anthony

Document Summary

Avogadro"s number- 6. 022 x 1023; the number of formula units in 1 mole. Mole- the amount of a substance containing the same number of formula units (6. 022 x 1023) as there are in exactly 12 g of 12c. One mole is equal to the molar mass in grams of any substance. Molar mass- the mass of avogadro"s number of atoms or molecules. The sum of the atomic masses of all the atoms in an element, compound, or ion. The mass of a ole of any formula unit. It is also known as the molecular mass. We count atoms by weighing them since they are so tiny. The mass (grams) of one mole of a compound is the molar mass. One mole of a compound contains avogadro"s number of formula units of that compound. Molar mass is determined by adding the molar masses of all the atoms in a formula. Molar masses are given to four significant figures in this text.