Moles and Molar Mass A number to remember!

Avogadro and his Number

6.022 x Currently best sig. fig.= (27)×10 23 Avogadro’s Number, Now officially, Avogadro’s Constant – since it’s a unit

What??? It’s the ratio of the mass of a single Proton to a gram! It is the number of Carbon atoms in grams of Carbon

Molar Mass The Mass of a Mole of Atoms H – C – N – O –

OK, What’s the Molar Mass of: H 2 O 2 H 2 O CH 4 CO 2 CH 3 CH 2 OH CH 3 COOH C 6 H 12 O 6

Mole Day October 23 from 6:02am to 6:02pm

moles to g - g to moles Now we have to actually use this…. If I have 1 mole of Copper, How many grams do I have? g = moles x molar mass g = 1 mole x g/mole => g

How many g in? 1.3 moles of water 6.55 moles of salt 12.1 moles of methane moles of carbon dioxide

Grams to Moles moles = g / molar mass How many moles in? 128 g of water g of salt 429 g of methane 10 g of carbon dioxide

How many molecules? If I have 1 mole of molecules, I have x molecules. So: molecules = moles x x How many molecules in? 36g of water 176g of carbon dioxide

Can you do it backwards? moles = molecules / x How many moles in? 2.8 x x 10 12

Disclaimer Aloha I put together these power points for use in my science classes. You may use them in your classes. Some images are public domain, some are used under the fair-use provisions of the copyright law, some are mine. Copyright is retained by the owners! Ted Brattstrom