Ch. 10 – The Mole Molar Conversions.

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Molar Conversions (p.80-85, )

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Presentation transcript:

Ch. 10 – The Mole Molar Conversions

A. What is the Mole? A large amount!!!! VERY A counting number (like a dozen) Avogadro’s number (NA) 1 mol = 6.02  1023 items A large amount!!!! VERY

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

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

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

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

Molar Mass Examples sodium bicarbonate NaHCO3 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

Molar Conversions molar mass 6.02  1023 MOLES (g/mol) (particles/mol) IN GRAMS MOLES NUMBER OF PARTICLES (g/mol) (particles/mol)

Molar Conversion Examples How many moles of carbon are in 26 g of carbon? 26 g C 1 mol C 12.01 g C = 2.2 mol C

Molar Conversion Examples How many molecules are in 2.50 moles of C12H22O11? 6.02  1023 molecules 1 mol 2.50 mol = 1.51  1024 molecules C12H22O11

Molar Conversion Examples Find the mass of 2.1  1024 molecules of NaHCO3. 2.1  1024 molecules 1 mol 6.02  1023 molecules 84.01 g 1 mol = 290 g NaHCO3