Can’t directly measure moles Measure units related to moles: –Mass (molar mass) –Number of particles (6.02 x 10 23 ) –Liters of gas (22.4 Liters at STP)

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Presentation transcript:

Can’t directly measure moles Measure units related to moles: –Mass (molar mass) –Number of particles (6.02 x ) –Liters of gas (22.4 Liters at STP) Can determine relationships between chemicals in a reaction using any units with stoichiometry

Write a balanced chemical equation Convert given substance “A” into moles To Convert moles of substance “A” into moles of substance B Use Mole to Mole Ratio Convert Moles of Substance “B” into desired units

Calculate the number of grams of NH 3 produced by the reaction of 5.40 g of hydrogen with an excess of Nitrogen. Balance the equation: N 2 + 3H 2  2NH 3

Known: 5.40 g H 2 Unknown: g NH g H 2 Given Quantity 2.02 g H 2 1 mol H 2 Change given unit into moles 3 mol H 2 2 mol NH 3 Mole Ratio 1 mol NH g NH 3 Change moles into desired units

Calculate the number of moles of ethane (C 2 H 6 ) needed to produce 12.6 g of water using the following equation: 2 C 2 H O 2  4 CO H g H 2 O 1 mol H 2 O 2 mol C 2 H g H 2 O 6 mol H 2 0 = mol C 2 H 6

How many molecules of oxygen are produced when 29.2 g of water is decomposed by electrolysis? 2H 2 0  2H 2 + O g H 2 O g H 2 01 mol O 2 1 mol H 2 O 1 mol O 2 2 mol H 2 O 6.02 x molec O 2