Stoichiometry Calculations Section 12.1 Mole to mole calculations.

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Presentation transcript:

Stoichiometry Calculations Section 12.1 Mole to mole calculations

Stoichiometry Calculations Mole to mole calculations problem gives you moles and ask for moles as an answer

We need 3 moles of H 2 gas produced, how many moles of potassium needs to react? K + H 2 O  KOH + H 2

How to solve mole to mole problems 1. Balance equation 2. Place number of moles and x above compound 3. Pull down ratios 4. Cross multiply to solve

Section 12.2 Mole to Mole conversions If the problem gives you moles and ask for moles as an answer you have a mole-mole problem If you needed 3 moles of H 2 gas produced, how many moles of potassium do you need to react? ? Moles 3 moles 2 K + 2 H 2 O  2 KOH + 1 H 2 1x = 2 x 3 x = 6 moles If we place the numbers given in the problem over the balanced equation our ratios are set up for us. Just pull down the numbers to form ratios.

Stoichiometry Practice I 2 H 2 + O 2  2 H 2 O How many moles of water can be produced with 6 moles of hydrogen? 6 mol x mol 2 H 2 + O 2  2 H 2 O x = 6 mol

Stoichiometry Practice I 2 H 2 + O 2  2 H 2 O How many moles of oxygen would be required to fully react with 8 moles of hydrogen? 8 mol x mol 2 H 2 + O 2  2 H 2 O 2x = 8 x = 4 moles of Oxygen

Stoichiometry Practice I 2 H 2 + O 2  2 H 2 O How many moles of water can be produced with 4 moles of oxygen? 4 mol x mol 2 H 2 + O 2  2 H 2 O x = 4 (2) = 8 mol

Stoichiometry Practice I 2 H 2 + O 2  2 H 2 O How many moles of hydrogen would be required to produce 10 moles of water? ? mol 10 mol 2 H 2 + O 2  2 H 2 O 2x = 20 x = 10 moles

Stoichiometry Practice I 2 H 2 + O 2  2 H 2 O How many moles of oxygen would be needed to produce 20 moles of water? ? mol 20 mol 2 H 2 + O 2  2 H 2 O 2x = 20 x = 10 moles

Be sure to balance the equation first! Na + Cl 2  NaCl

How many moles of sodium would be required to fully react with 10 moles of chlorine? 2Na + Cl 2  2NaCl

How many moles of NaCl can be produced with 9 moles of chlorine? 2Na + Cl 2  2NaCl

How many moles of Cl 2 would be required to produce 18 moles of salt? 2Na + Cl 2  2NaCl

How many moles of sodium would be needed to produce 20 moles of salt? 2Na + Cl 2  2NaCl