Moles and Molar Masses.

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Presentation transcript:

Moles and Molar Masses

Moles The smallest unit of matter with unique properties is an atom. Atoms are too small to use for measurement in experiments. 6.02 x 1023 atoms = 1 mole

Moles con’t The mass of 1 mole of an element can be found on the periodic table. Atomic mass or atomic weight =# of grams in 1 mole

Practice Problems What is the molar mass of C? What is the molar mass of sodium?

Answers Atomic mass of carbon = 12.01 1 mole C = 12.01gC 2. Atomic mass of sodium = 22.99 1 mole Na = 22.99gNa

Finding the Molar Mass of Compounds The molar mass of a compound is equal to the sum of all the molar masses of the atoms in the compound.

Practice Problem What is the molar mass of H2O? Mass of H = 1.008g Mass of H2 = 1.008g x 2 Mass of H2 = 2.016g Mass of O = 16.00g 1 mole of H2O = 2.016g + 16.00g 1 mole of H2O = 18.016gH2O