Molecular Mass.

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Presentation transcript:

Molecular Mass

Elements Single elements by themselves 1 mole = 6 x 1023 atoms Example: Sodium Na 1 mole = 6 x 1023 atoms 1 mole Na = 6 x 1023 atoms of Na 1 mole = atomic weight in grams 1 mole Na = 23 grams Na

Compounds More than one element chemically combined Example: Na2(SO4) 1 mole = 6 x 1023 molecules 1 mole Na2SO4 = 6 x 1023 molecules Na2SO4 1 mole = molecular weight in grams 1 mole Na2SO4 = (2x23) + (1x32) + (4x16) = 142 grams

Dimensional Analysis If you had 5 grams of Na, how many moles do you have? Identify what is given to you. - 5 grams Na Identify what you are trying to find. - moles of Na

Dimensional Analysis If you had 5 grams of Na, how many moles do you have? 3. Identify the correct conversion factor. 1 mole of Na, =23 grams, therefore 1 mole Na OR 23 grams 23 grams 1 mole Na

Dimensional Analysis If you had 5 grams of Na, how many moles do you have? Calculate the answer. 5 grams Na 1 mole Na = 0.217 moles Na 23 grams Na

Dimensional Analysis If you had 5 grams of Na2SO4, how many moles do you have? Identify what is given to you. - 5 grams Na2SO4 Identify what you are trying to find. - moles of Na2SO4,

Dimensional Analysis If you had 5 grams of Na2SO4, how many moles do you have? 3. Identify the correct conversion factor. 1 mole of Na2SO4, =142 grams, therefore 1 mole Na2SO4, OR 142 grams 142 grams 1 mole Na2SO4,

Dimensional Analysis If you had 5 grams of Na2SO4, how many moles do you have? Calculate the answer. 5 grams Na2SO4 1 mole Na2SO4, = 0.035 mol Na2SO4 142 grams Na2SO4