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Presentation transcript:

The Mole: A Shortcut for Chemists S-C-8-1_The Mole Presentation Source:

The Mole The mole is a counting unit for chemists, the same way a baker uses a dozen. 1 dozen = 12 objects 1 mole = 6.02 × objects = 602,000,000,000,000,000,000,000 objects That’s almost a trillion trillion! 6.02 × is called Avogadro’s number. “Mole” in writing; “mol” in calculations.

Representative Particles Moles can be used to count “representative particles:” atoms, molecules, ions, and formula units. The representative particle of an ionic compound is the formula unit. The representative particle of a covalent compound is the molecule. The representative particle of an element is the atom unless it is a diatomic element, in which case it is the molecule.

1 mole of any of the representative particles = 6.02 × of those particles. How many atoms in 1 mol of aluminum? How many molecules are in 1 mol of water? How many formula units are in 1 mol of salt? How many atoms are in 0.5 mol of aluminum? How many molecules are in 2 mol of water? How many formula units are in 2.67 mol of salt?

Dimensional Analysis

Dimensional Analysis (Factor-Unit Method) A simple, powerful tool. Converts among measurements expressed in different units. Develops relationships between units and expresses this relationship as a factor of both units.

Dimensional Analysis (Factor-Unit Method) Example: – 500 grams is equivalent to how many pounds?

Dimensional Analysis (Factor-Unit Method) Example: – 500 grams is equivalent to how many pounds? Step 1: Write the statement as a mathematical formula.

Dimensional Analysis (Factor-Unit Method) Example: – 500 grams is equivalent to how many pounds? Step 2: Write the relationship between the known and unknown units. 1 pound = 454 grams

Dimensional Analysis (Factor-Unit Method) Example: – 500 grams is equivalent to how many pounds? Step 3: Write the relationship as two ratios.

Dimensional Analysis (Factor-Unit Method) Example: – 500 grams is equivalent to how many pounds? Step 4: Select the relationship that has the unit sought on top.

Dimensional Analysis (Factor-Unit Method) Example: – 500 grams is equivalent to how many pounds? Step 4: Select the relationship that has the unit sought on top.

Dimensional Analysis (Factor-Unit Method) Example: – 500 grams is equivalent to how many pounds? Step 5: Perform the calculation.

Dimensional Analysis (Factor-Unit Method) Example: – 500 grams is equivalent to how many pounds? Step 6: Check the answer. Is it reasonable?

Dimensional Analysis (Factor-Unit Method) Example: – A can of Coca-Cola contains 12 fluid ounces (fl oz). What is the volume of the can in quarts? (Given: 1 qt = 32 fl oz)

Dimensional Analysis (Factor-Unit Method) Example: Solution – A can of Coca-Cola contains 12 fluid ounces (fl oz). What is the volume of the can in quarts? (Given: 1 qt = 32 fl oz)

Dimensional Analysis (Factor-Unit Method) Example: Solution – A can of Coca-Cola contains 12 fluid ounces (fl oz). What is the volume of the can in quarts? (Given: 1 qt = 32 fl oz) 1 quart = 32 fl oz

Dimensional Analysis (Factor-Unit Method) Example: Solution – A can of Coca-Cola contains 12 fluid ounces (fl oz). What is the volume of the can in quarts? (Given: 1 qt = 32 fl oz)

Dimensional Analysis (Factor-Unit Method) Example: Solution – A can of Coca-Cola contains 12 fluid ounces (fl oz). What is the volume of the can in quarts? (Given: 1 qt = 32 fl oz)

Atomic Masses What do the atomic masses on the periodic table represent? Carbon has an atomic mass of 12; this means a carbon atom weighs 12 atomic mass units (amu). The actual mass of an atom of carbon is only 2 x grams. Practice: What is the atomic mass of one molecule of O 2 ? = amu

Formula Weight Formula weight: The weight of a molecule or an ionic compound. Molecule: CO = amu For molecules, formula weight is also called the “molecular weight.” Ionic compound: NaCl = amu

Molar Mass Molar mass = the mass of one mole. For atoms, molar mass is the same as atomic mass. The molar mass of a compound allows you to convert between the amount of the element (moles) and its mass (grams). If you want to convert from amount (moles) to mass (grams): If you want to convert from mass (grams) to amount (moles): # of moles × Formula weight = Mass (in grams) 1 mol mass (grams) × 1 mol = # of moles formula weight

Molar Mass Examples 1 mol N = g N Written as g/mol Calculate the following molar masses: Br CaF 2 NO 2 NaCl

Molar Mass Examples: Solutions Calculate the following molar masses: Br CaF (2) = g/mol NO (2) = g/mol NaCl = g/mol

Conversion Factors: Mole-Mass Problems The red portions in the examples above are the conversion factors. Conversion factor: A ratio equal to one that expresses the same quality in two different ways. Another example: To find the number of eggs in 3 dozen: 3 dozen x 12 eggs/dozen = # of eggs

Mole-Mass Problems 1. What is the mass of 0.50 mol HCl? 2. What is the mass of 2 mol Zn? 3. How many moles are in 1.5 g of Cu? 4. How many moles are in 50 g H 2 SO 4 ?

Mole-Mass Answers 1. What is the mass of 0.50 mol HCl? 0.50 mol × g/mol = g HCl 2. What is the mass of 2 mol Zn? 2 mol × g/mol = g 3. How many moles are in 1.5 g of Cu? 1.5 g × 1 mol/63.55 g = 0.02 mol 4. How many moles are in 50 g H 2 SO 4 ? 50 g × 1 mol/98.09 g = 0.51 mol