Limiting Reactants.

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Limiting Reactants.

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Presentation transcript:

Limiting Reactants

Limiting Reactants A chemical reaction will stop when you run out of one of your ____________ ____________– limits the extent of the reaction. Determines the amount of product that is formed. It runs out first ____________– left over reactant

Limiting Reactant Problems A limiting reactant problem can be easily identified because you have TWO givens You basically are just going to do 2 stoichiometry problems

Steps Write the _____________________ Start with given #1 and go to desired product Start with given #2 and go to the same product The one that formed the ____________ amount of grams is the limiting reactant

Example S8 + 4Cl2  4S2Cl2 200.00 g of S8 and 100.00 g of Cl2 are combined in a flask. How much S2Cl2 will you get?

Other questions What was the limiting reactant? What was the excess reactant? How much excess did we have left over after the reaction was completed?

Another Example P4 + 5O2  P4O10 If we used 25.4 g P4 and 50.0 g O2 answer the following questions. What is the limiting reactant? What is the excess reactant? How much P4O10 will you get? How much excess did you use? How much excess will you have left over?

Another Example What is the limiting reactant? What is the excess reactant? How much P4O10 will you get? How much excess did you use? How much excess will you have left over?