The Mole , Ch. 10 You need a calculator from this chapter on.

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The Mole , Ch. 10 You need a calculator from this chapter on. - PowerPoint PPT Presentation

The Mole , Ch. 10 You need a calculator from this chapter on. *The mole was invented as a way to describe number of atoms. *1 mole = 6.02 x 10 23 things. 602,000,000,000,000,000,000,000 things. What if you had a mole of \$1 bills?.

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The Mole, Ch. 10You need a calculator from this chapter on.

*1 mole = 6.02 x 1023 things.

• 602,000,000,000,000,000,000,000 things.
*Converting moles to # of particles
• Convert 3 moles of aluminum to number of atoms of aluminum.
• Convert 7 moles of methane to molecules of methane.
*Molar Mass
• One mole of an atom will weigh ___ grams (shown on the periodic table).
*Convert moles to grams
• Mg. 1 mole  ? grams
• 6.94 grams
Try it:
• 6 moles of H2O to grams.
• 126 g of NaF to moles.
• 108 grams, 3 moles

*A mole of any gas takes up 22.4 L (at STP). This is Avogadro’s Hypothesis.

• This is like a cube with sides of 28.2 cm.

One mole of He, H, O, N, etc. will all take up 22.4 L.

• Question: How many He atoms are there in 22.4 L?
• Question: How many H2 molecules are there in 22.4 L?
Gas Density:
• Often is measured in g/L.
• What is the density of H2 gas at STP?
• .089 g/L

• Try: 55 E23 particles of He to volume of gas. Try: 55 E23 particles of He to grams of gas.

Be able to solve mole problems.

• Compare a mole of eggs to a dozen eggs.
• What is a mole useful for?
Percent Composition
• Is the percent by mass of each element in the compound.

*Percent Composition from mass data:

• 5.4 g of oxygen and 8.2 g of magnesium in a 13.6 gram compound.
• 60.3% Mg, 39.7% O

*Percent composition from the chemical formula Find the amount of grams of each element in 1 mole of the compound, then find the %.

• C3H8
• 81.8% C, 18% H
• *Molecular formula: Expresses the atoms in their actual abundance.
• Exp: H2O2 HO
*Determining Empirical Formula:
• 25.9% N
• 74.1 % O
• Assume 100 g of the compound, find the # of moles, then find the whole number ratio.
• Answer = 2 mol N, 5 mol O

Empirical formula to Molecular formula If the empirical formula is CH4N and the molecular molar mass is 60 g/mol, what is the molecular formula?

• C2H8N2
Assignment
• Draw and explain with words:
• If you could have a mole of anything, what would you want and why?
• Can be creative and funny.