# Students know

Students know

The Mole1 dozen =1 gross =1 ream =1 mole =121445006.02 x 10 23There are exactly 12 grams ofcarbon-12 in one mole of carbon-12.

Calculating Formula MassCalculate the formula mass of carbondioxide, CO 2 .12.01 g + 2(16.00 g) = 44.01 g! One mole of CO 2 (6.02 x 10 23 molecules)has a mass of 44.01 grams

Atomsor moleculesLiters22.4LMoleAtomicMassMoleRelationshipsGrams

Calculations with Moles:Converting moles to gramsHow many grams of lithium are in 3.50 molesof lithium?3.50 mol Li6.94 g Li1 mol Li= 45.1 g Li

Calculations with Moles:Converting grams to molesHow many moles of lithium are in 18.2 gramsof lithium?18.2 g Li1 mol Li6.94 g Li= 2.62 mol Li

Calculations with Moles:Using Avogadro’s NumberHow many atoms of lithium are in 3.50moles of lithium?3.50 mol6.02 x 10 23 atoms1 mol= 2.07 x 10 24 atoms

Calculations with Moles:Using Avogadro’s NumberHow many atoms of lithium are in 18.2 g oflithium?18.2 g Li1 mol Li 6.022 x 10 23 atoms Li6.94 g Li 1 mol Li(18.2)(6.022 x 10 23 )/6.94= 1.58 x 10 24 atoms Li

Standard Molar VolumeEqual volumes of all gases at the same temperatureand 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

Calculations with Moles:Using Standard Molar VolumeHow many moles of hydrogen are in 100 Lof hydrogen at STP?100 L1 mol22.4 L= 4.64 mol

Calculations with Moles:Using Standard Molar VolumeHow many liters are occupied by 3 moles ofoxygen gas at STP?3 mol22.4 L1 mol= 67.2 L

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