2 CA StandardsStudents know the quantity one mole is set by defining one mole of carbon 12 atoms to have a mass of exactly 12 grams.Students know one mole equals 6.02 x 1023 particles (atoms or molecules).Students know how to determine the molar mass of a molecule from its chemical formula and a table of atomic masses and how to convert the mass of a molecular substance to moles, number of particles, or volume of gas at standard temperature and pressure.
3 The Mole 1 dozen = 12 1 gross = 144 1 ream = 500 1 mole = 6.02 x 1023 There are exactly 12 grams of carbon-12 in one mole of carbon-12.
4 I didn’t discover it. Its just named after me! Avogadro’s Number6.02 x 1023 is called “Avogadro’s Number” in honor of the Italian chemist Amadeo Avogadro ( ).I didn’t discover it. Its just named after me!Amadeo Avogadro
5 Calculating Formula Mass Calculate the formula mass of carbon dioxide, CO2.12.01 g + 2(16.00 g) =44.01 g One mole of CO2 (6.02 x 1023 molecules) has a mass of grams
6 Mole Relationships Liters Mole Grams Atoms or molecules 6.02 x 1023 22.4L6.02 x 102322. 4 LMoleMole RelationshipsAtomicMassGrams
7 Calculations with Moles: Converting moles to grams How many grams of lithium are in 3.50 moles of lithium?3.50 mol Li6.94 g Li= g Li45.11 mol Li
8 Calculations with Moles: Converting grams to moles How many moles of lithium are in 18.2 grams of lithium?18.2 g Li1 mol Li= mol Li2.626.94 g Li
9 Calculations with Moles: Using Avogadro’s Number How many atoms of lithium are in 3.50 moles of lithium?3.50 mol6.02 x 1023 atoms= atoms2.07 x 10241 mol
10 Calculations with Moles: Using Avogadro’s Number How many atoms of lithium are in 18.2 g oflithium?18.2 g Li1 mol Li6.022 x 1023 atoms Li6.94 g Li1 mol Li(18.2)(6.022 x 1023)/6.94= atoms Li1.58 x 1024
11 Standard Molar Volume 1 mole of a gas occupies 22.4 liters of volume Equal volumes of all gases at the same temperature and pressure contain the same number of molecules.- Amedeo AvogadroAt STP (Standard Temperature and Pressure):1 mole of a gas occupies 22.4 liters of volume
12 Calculations with Moles: Using Standard Molar Volume How many moles of hydrogen are in 100 L of hydrogen at STP?100 L1 mol= mol4.6422.4 L
13 Calculations with Moles: Using Standard Molar Volume How many liters are occupied by 3 moles of oxygen gas at STP?3 mol22.4 L= L67.21 mol