Unit 4 Lesson 9

Avogadro's Number

• 1 mol = 6.022 x 10^23

Scientific notation

• The decimal always has one number to the left
• Positive --> move the decimal point to the right
• Negative --> move the decimal point to the left

The mass of 1 mol of a substance is called the molar mass

• Atomic mass given on the periodic table is = to the mass of 1 mole of atoms of the element in grams
• Molar mass allows you to convert between moles of atoms and grams of atoms

Ex:

Practice Problems

4) a. 14  b. 20.1797  c. 35.5  d. 63.5

5) a. Carbon  b. iron  c. Gold  d. Gold

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