Supplemental packet page 117. anythingtwelve 18 eggs x ________________ = 1 dozen eggs 12 eggs anything6.023 x 10 23 6.023 x 10 23 Gummy bears Gummy bears.

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Presentation transcript:

Supplemental packet page 117

anythingtwelve 18 eggs x ________________ = 1 dozen eggs 12 eggs anything6.023 x x Gummy bears Gummy bears atoms x atoms pennies x pennies 1.5 dozen eggs Supplemental packet page 119 Called Avogadro’s Number

6.023 x Fex55.85 = Nx14.00 =  x16.00 = Supplemental packet page 120

6.023x10 23 atoms 1 mole atoms 18 moles x ________________ = 6.023x10 23 molecules 1 mole molecules 1.1x10 25 molecules 6.023x10 23 molecule 1 mole 3 atoms 1 molecule 4.8x10 24 atoms 1 mole H 2 O g H 2 O 6.023x10 23 molecules 1 mole 6.02x10 23 molecules 18 grams x __________ x _____________ x _______ = H2OH2O 18.0 grams x __________ x __________________= H2OH2O H2OH2O 18 moles x ________________ = Pb x10 25 atoms Pb 1 mole H 2 O g H 2 O molar mass 1.1x10 25 (correct Sig Figs) of H 2 O

How many sulfur atoms are present in moles of S nonmetal? How many moles of K are present in 5.92 x10 24 atoms of K metal? Supplemental packet page 121

Avogradro’s number(grams) x (mol per grams) 1 mol C = g C = 6.02 x atoms C How many atoms of C are present in 27.4 grams of carbon nonmetal? moles x6.02 x atoms 1 mole 1 mol C = g C = 6.02 x atoms C Combined we have a grams to particles equivalent statement

How many atoms are present in a formula unit of sodium sulfate Na 2 SO 4 ? Just as a mole of atoms is based on the atomic mass or atomic weight, a mole of a compound is based upon the formula mass or formula weight amu g 7 atoms Na 2 SO x 10 –1 mol Supplemental packet page 122

Note you must be able to derive correct formulas from names This is called a pentahydrate Molar Mass Calculations; one mole amount of a substance in grams Supplemental packet page 122

molar mass g/mol (molar mass; g/mol) (grams) How many moles are there in 41.7 g of NaNO 3 ? moles (molar mass; g/mol) In every calculuation problem ALWAYS Calculate molar mass; MAKE a Table and Do it. Quickly convert to moles by dividing grams by molar mass Memorize this!!!! The grams to moles conversion set-up Suppl packet page 123

Be sure you are able to write correct formulas. Most students fail in the second half of the semester because they cannot correctly write a substance’s formula CaSO 4 (NH 4 ) 2 CO 3 Most students fail in the second half of the semester because they cannot correctly calculate a molar mass MAKE at TABLE when calculating molar mass How many moles of calcium sulfate atoms are present in 12.6 grams of calcium sulfate ionic salt? How many moles of ammonium carbonate are present in 6.18 x 10 3 grams of ammonium carbonate ionic salt? Ca 2+ SO 4 2– NH 4 + CO 3 2– NH 4 + CaSO 4 (NH 4 ) 2 CO 3

CaSO 4 (NH 4 ) 2 CO 3 moles (molar mass; g/mol) Quickly convert to moles by dividing grams by molar mass Memorize this!!!! (grams) g/mol 12.6 g CaSO g/mol 6.18 x10 3 g (NH 4 ) 2 CO 3 Remember the short cut for converting grams to moles!!!!!!! How many moles of calcium sulfate atoms are present in 12.6 grams of calcium sulfate ionic salt? How many moles of ammonium carbonate are present in 6.18 x 10 3 grams of ammonium carbonate ionic salt?

Converting Mole Amounts to Grams K+K+ Cl – Ba 2+ NO 3 – KClBa(NO 3 ) 2 NO 3 – KCl Ba(NO 3 ) 2 Converting Mole Amounts to Grams, just take moles multiplied by molar mass Memorize this!!!!