WARM UP 4 Li + O2  2 Li2O If you have 804 g of Li available for the reaction, calculate the amount of O2 you will need to pump into the reaction to ensure.

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Presentation transcript:

WARM UP 4 Li + O2  2 Li2O If you have 804 g of Li available for the reaction, calculate the amount of O2 you will need to pump into the reaction to ensure that all the Li reacts.

Limiting vs. Excess http://www.youtube.com/watch?v=oYIHLUxzRr8

Limiting Reagents

Limiting vs. Excess Limiting reagent The first reactant used up in a reaction After it’s gone, no more product formed

Limiting vs. Excess Excess reagent Not used up in a reaction, extra left over

Limiting vs. Excess

Calculating Limiting Reagent Ex: Write balanced equation Calculate yield (in grams) from each reactant Less product = limiting reagent More product = excess reagent

Calculating Yield Theoretical yield is determined by limiting reagent Lesser amount of product

WRAP UP H3PO4 + 3 KOH  K3PO4 + 3 H2O Given 5.0 moles of KOH and 2.0 moles of H3PO4, how many moles of K3PO4 can be prepared? Which reactant is the limiting reagent? Which is the excess?

WARM UP 2 Al + Fe2O3  2 Fe + Al2O3 If you reacted 24 grams of aluminum with 190 grams of Fe2O3 and obtained .28 moles of Al2O3… What is your limiting reagent? Excess reagent? Percent yield?

WRAP UP SO2 + CaO  CaSO3 If 975 g of SO2 is to be removed by the reaction, what mass of CaO will be required to completely react the SO2 and make it the limiting reagent?

WARM UP Take out your Production of Salt lab report with a Question, Hypothesis, and Procedure.

WARM UP Measure your beaker with the dry salt. Clean up you lab station. Begin your calculations at your desk.