IIIIIIIV Molar Conversions & Calculations CH. 11 – THE MOLE C. JOHANNESSON.

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IIIIIIIV Molar Conversions & Calculations CH. 11 – THE MOLE C. JOHANNESSON

A. What is the Mole? A counting number (like a dozen) Avogadro’s number (N A ) 1 mol = 6.02  items C. JOHANNESSON A large amount!!!!

A. What is the Mole? 1 mole of pennies would cover the Earth 1/4 mile deep! C. JOHANNESSON n 1 mole of hockey pucks would equal the mass of the moon! n 1 mole of basketballs would fill a bag the size of the earth!

B. Molar Mass Mass of 1 mole of an element or compound. Atomic mass tells the... ◦ atomic mass units per atom (amu) ◦ grams per mole (g/mol) Round to 2 decimal places C. JOHANNESSON

B. Molar Mass Examples carbon aluminum zinc C. JOHANNESSON g/mol g/mol g/mol

B. Molar Mass Examples water sodium chloride C. JOHANNESSON H2OH2O  2(1.01) = g/mol  NaCl  = g/mol

B. Molar Mass Examples sodium hydrogen carbonate sucrose C. JOHANNESSON  NaHCO 3  (16.00) = g/mol  C 12 H 22 O 11  12(12.01) + 22(1.01) + 11(16.00) = g/mol

C. Percentage Composition the percentage by mass of each element in a compound C. JOHANNESSON

C. Percentage Composition Find the % composition of Cu 2 S. C. JOHANNESSON  100 = %Cu = g Cu g Cu 2 S  100 = %S = g S g Cu 2 S % Cu 20.15% S

C. Percentage Composition Find the percentage composition of a sample that is 28 g Fe and 8.0 g O. C. JOHANNESSON %Fe = 28 g 36 g  100 = 78% Fe %O = 8.0 g 36 g  100 = 22% O

C. Percentage Composition How many grams of copper are in a 38.0-gram sample of Cu 2 S? C. JOHANNESSON (38.0 g Cu 2 S)( ) = 30.3 g Cu Cu 2 S is % Cu