The Mole and Molar Mass

The Mole, Chemistry's Mascot

Units of Measurement Fundamental Units Dozen = 12 things Bakers dozen= 13 things Pair= 2 things Decade = 10 years Gross = 144 things Ream = 100 things I Mole = 6.02 x 1023 things

I Mole = 6.02 x 1023 This is a huge number! How long would it take to spend a mole of pennies …. at a $million /day? How long is a mole of seconds?

Why use this value? It makes conversions to mass easy since one mole of protons has a mass of one gram! The molar mass (mass of one mole) of a substance is the same value as the formula mass but in grams instead of amu.

B. Molar Mass Examples carbon aluminum zinc 12.01 g/mol 26.98 g/mol

B. Molar Mass Examples water sodium chloride H2O 2(1.01) + 16.00 = 18.02 g/mol NaCl 22.99 + 35.45 = 58.44 g/mol

B. Molar Mass Examples sodium bicarbonate sucrose NaHCO3 22.99 + 1.01 + 12.01 + 3(16.00) = 84.01 g/mol C12H22O11 12(12.01) + 22(1.01) + 11(16.00) = 342.34 g/mol

Measuring with Moles The Mole is a counting unit Called the chemist’s dozen Used to count number of Atoms Molecules (nm + nm) or (m + nm) We will count both atoms and molecules

Conversions with Moles How do you find mass of one mole of substance? We can do this if we know the formula mass When we do this we get the MOLAR MASS The mass in grams of 1 mole of substance is equal to the formula mass Units: grams/mol

Conversions with Moles Mass = number of moles Molar mass

Super Mole Highway So Far we Can Convert Between Moles Grams Particles The Mole Highway will help us convert from one to another

Super Mole Highway molar mass 6.02  1023 MOLES (g/mol) IN GRAMS MOLES NUMBER OF PARTICLES (g/mol) (particles/mol)