Intro to Stoichometry.

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Presentation transcript:

Intro to Stoichometry

Mole Ratio

Predict the products and balance the following equation: Li + O2 

Predict the products and balance the following equation: 4 Li + O2  2 Li2O 4 moles of Li react with 1 mol of O2 to produce 2 moles of Li2O

4 Li + O2  2 Li2O If 1.83 mol of Li reacted, how many moles of O2 reacted? What is the mole ratio of Li to O2? From the balanced reaction: 4 mol Li or 1 mol O2

This is called the “Mole Ratio” 4 Li + 1 O2  2 Li2O If 1.83 mol of Li react, how many moles of O2 react? This is called the “Mole Ratio” ? Mol O2 = 1.83 mol Li x 1 mol O2 0.458 mol O2 1 4 mol Li The Mole Ratio allows us to transition from units of one atom/molecule to units of another atom/molecule The Equation MUST be Balanced

“Mole Ratio” between Li2O and Li 4 Li + O2  2 Li2O If 1.83 mol of Li reacted, how many moles of Li2O will be produced? “Mole Ratio” between Li2O and Li ? mol Li2O = 1.83 mol Li x 2 mol Li2O 0.915 mol Li2O 1 4 mol Li

Predict the products and balance the following equation: FeS 

Predict the products and balance the following equation: 8 FeS  8 Fe + S8 If 4.18 mol FeS decomposes, how many moles of Fe are produced? 4.18 mol Fe How many moles of sulphur are produced? 0.523 mol S

Predict the products and balance the following equation: Lead reacts with copper(I) sulphate. Pb + Cu2SO4 

Predict the products and balance the following equation: Pb + Cu2SO4  PbSO4 + 2Cu If 9.78 mol of Cu is produced, how many moles of Pb reacted? 4.89 mol Pb If 3.45 mol Cu2SO4 reacts, how many moles of PbSO4 are produced? 3.45 mol PbSO4