Mole Gangnam Style https://www.youtube.com/watch?v=HnRHBw-xjVo.

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Presentation transcript:

Mole Gangnam Style

Mole Map Grams mole molecules atoms Atoms (element) 6.02 x # atoms per molecule 6.02 x formula unit # ions per formula unit MrMr

Dimensional Analysis How many moles are in 45.7 g of NO 2 ? Molar mass NO 2 = g + 2( g) = g/mol 1.Ask yourself the question – Can I convert directly from grams to moles? YES – molar mass has units of grams/mole 2. Start with your “given” from the original problem. 3. Use conversion factor that will allow you to “cancel” out grams and give you moles g of NO g 1 mol = mol 4. Calculate & express answer with correct sig. figs. and units!

Dimensional Analysis 1.Ask yourself the question – Can I convert directly from moles to atoms of an element? YES – there are 6.02 x atoms per mole 2. Start with your “given” from the original problem. 3. Use conversion factor that will allow you to “cancel” out grams and give you moles mol Fe 1 mol Fe 6.02 x atoms Fe = 6.02 x Fe atoms 4. Calculate & express answer with correct sig. figs. and units! How many atoms are in 10.0 moles of Iron (Fe)?

Dimensional Analysis 1.Ask yourself the question – Can I convert directly from grams to molecules? NO– I have to go through moles 2. Start with your “given” from the original problem. 3. Use conversion factor that will allow you to “cancel” out grams and give you moles g H 2 SO g 1 mol = 7.37 x molecules 4. Calculate & express answer with correct sig. figs. and units! How many molecules are in 12.1 g of H 2 SO 4 ? 6.02 x molecules 1 mol

Dimensional Analysis NOTE: How many atoms are in 1 molecule of H 2 SO 4 ? g H 2 SO g 1 mol = x atoms How many atoms are in g of H 2 SO 4 ? 6.02 x molecules 1 mol 2H + 1S + 4O = 7 total atoms per molecule 1 molecule H 2 SO 4 7 atoms

Dimensional Analysis What is the formula for potassium oxide? 32.6 g K 2 O g 1 mol = 2.08 x formula units How many formula units are in 32.6 grams of potassium oxide? 6.02 x f. units 1 mol K2OK2O

Dimensional Analysis What is the formula for lithium sulfate? 125 g Li 2 SO g 1 mol = 1.37 x Li ions How many lithium ions are in 125g of lithium sulfate? 6.02 x f. units 1 mol Li 2 SO 4 1 f. unit Li 2 SO 4 2 Li ions How many lithium ions are in one formula unit? 2