How many moles of O would be in 0.75 moles of CO 2 ? Given: Find:

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Presentation transcript:

How many moles of O would be in 0.75 moles of CO 2 ? Given: Find:

How many oxygen atoms would be in 0.75 moles of CO 2 ? Given: 0.75 moles of CO 2 cf: Find: atoms 0.75 mol CO 2 x 2 mol O x 6.02x10 23 O atoms = 9.0 x10 23 O atoms 1 mol CO 2 1 mol O

We know that 6.02 x particles = 1 MOL HOW MUCH does A MOLE WEIGH ? but…

MOLAR MASS - the mass, (in grams) of one MOLE of a substance OR it’s how much a mole weighs Mole of helium 6.02 x C atoms A mole of Au

MOLAR MASS - the mass, (in grams) of one MOLE of a substance OR it’s how much a mole weighs Mole of eggs 6.02 x feathers A mole of Au

Recall atomic mass units - amu. This is the mass of an atom of a given element that you simply find on the periodic tablet ex: H = 1.01 amu He = 4.00amu

There IS relationship between amu and grams: 1 amu = x grams

What is the amu of C ? C has 6 p+ and 6n Mass of each p & n = 1.67 x g 12 X x g = x g = mass C atom How many C atoms are in 1 mole? 6.02 x atoms/mol What is the mass of a mole of C atoms? 6.02 x atoms mole x g = atom grams mol

How can you find the mass of a mole of any ELEMENT ? LOOK on the PERIODIC TABLE ! it is the same number as the amu A mole of Cu has a mass of 63.55g A mole of Ne has a mass of A mole of Ca has a mass of 40.08g

How can you find the mass of a mole of any COMPOUND ? FIRST - get the FORMULA Need to know 1) what atoms and 2) how many of each

How can you find the mass of a mole of any COMPOUND ? THEN look on the PERIODIC TABLE ! Check the amu of EACH ELEMENT in the FORMULA and ADD ! FIRST - get the FORMULA Need to know 1) what atoms and 2) how many of each

Example #1: How much does a mole of water weigh? the FORMULA - H 2 O

example #2: What is the molar mass of carbon dioxide - CO 2. How much would 2.0 moles of CO 2 weigh?

Particle Island

example #3: The molar mass of CO 2 = 44.01g, how many grams would be in 0.36 mol of CO 2 Given: Find:

example #4: how many moles of CO 2 would be in a 2.35 g sample of CO 2 molar mass of CO 2 = 44.01g, Given: Find:

example #5: How many CO 2 molecules would be in a 2.35 g sample of CO 2, 1 mol = 44.01g,

So Daria, how long do you think this mole worksheet will take - all night? No way Lauren! maybe 20 minutes