What is a Mole How many socks come in a pair? 2 How many eggs are in a dozen? 12 How many eggs come...
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Transcript of What is a Mole How many socks come in a pair? 2 How many eggs are in a dozen? 12 How many eggs come...
The mole
What is a MoleHow many socks come in a pair?
2How many eggs are in a dozen?
12How many eggs come in a gross?
144How many pencils come in a ream?
500
So how many things come in a mole?
Conversion ReviewDimensional Analysis
Example Problems
The Mole and Mass
Relative Mass
Molar Mass
Using molar mass
Converting between mass and atoms
Using the Mole with compounds
Chemical Formulas and the Mole
Molar Mass of a CompoundDetermine the molar mass of each of the
following compounds:NaOHCaCl2
KC2H3O2
C2H5OHHCNCCl4
(NH4)3PO4
Converting moles to massThe characteristic odor of garlic is due to the
compound (C3H5)2S. What is the mass of 2.5 moles of (C3H5)2S?
What is the mass of 3.25 mol of H2SO4?
Converting Mass to MolesCalculate the number of moles in 325 g of
Calcium hydroxide Ca(OH)2?
Calculate the number of moles in 22.6 g of AgNO3.
Mass to Number of Particles How many Aluminum Chloride molecules are
present in 35.6 g of AlCl3
How many Al atoms are there?
How many Cl atoms are there?
ExampleAluminum oxide (Al2O3) when dissolved in
water breaks apart into ions (Al3+ and O2-) how many moles of Al3+ will be produced when 1.5 moles of Al2O3 are dissolved in water?
Examples1. What is the molar mass of ethanol C2H5OH?
How many ethanol molecules are present in 45.6 g?How many carbon atoms are there in 45.6 g of ethanol?How many hydrogen atoms are there in 45.6 g of ethanol? How many oxygen atoms are there in 45.6 g of ethanol?
2. A sample of sodium sulfite Na2SO3 has a mass of 2.25 g How many molecules of sodium sulfite are there? How many atoms of sodium are there? How many atoms of Sulfur are there? How many atoms of oxygen are there?
Percent CompositionThe molar mass of NaOH is Na – 22.98 g/molO – 16 g/molH – 1 g/molTotal: 39.98 g/mol
ExampleNaHCO3
Empirical Formula
ExampleFind the empirical formula for hydrogen
peroxide which has a molar mass of 34 g/mol and is 5.9% Hydrogen and 94.1% Oxygen
Molecular Formula
Example
ExampleFind the empirical and molecular formula for
a compound that is 26.5% K, 35.4% Cr, and 38.1% O and has a molar mass of 294.2 g/mol.
ExampleFind the empirical and molecular formula for
a compound that is 26.7% carbon, 2.2% hydrogen, and 71.1% oxygen and has a molar mass of 90 g/mol.