Limiting Reagents.

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Presentation transcript:

Limiting Reagents

Materials You Need Note Sheet Periodic Table Calculator

Limiting Reagent The reagent that determines the amount of product that can be formed by a reaction. The reaction occurs only until the limiting reagent is used up.

The reactant that is not completely used up in the reaction. Excess Reagents The reactant that is not completely used up in the reaction.

Let’s make a smore! 1 marshmallow 2 graham crackers ½ chocolate bar Recipe: We have: 1 marshmallow 2 graham crackers ½ chocolate bar 3 marshmallows 4 graham crackers 2 chocolate bars How many Smores can we make??

How do we know it is a L.R. Problem? Two quantities of reactants are given

Practice Problem 1 If 4.0 moles of hydrogen gas and 1.0 mole of oxygen gas are reacted, how many grams of water will be produced?

Practice Problem 1 4.0 moles H2 If 4.0 moles of hydrogen gas and 1.0 mole of oxygen gas are reacted, how many grams of water will be produced? 4.0 moles H2

Practice Problem 1 4.0 moles H2 2 moles H2O 2 moles H2 If 4.0 moles of hydrogen gas and 1.0 mole of oxygen gas are reacted, how many grams of water will be produced? 4.0 moles H2 2 moles H2O 2 moles H2

Practice Problem 1 4.0 moles H2 2 moles H2O 2 moles H2 =4.0 moles H2O If 4.0 moles of hydrogen gas and 1.0 mole of oxygen gas are reacted, how many grams of water will be produced? 4.0 moles H2 2 moles H2O 2 moles H2 =4.0 moles H2O

Practice Problem 1 4.0 moles H2 2 moles H2O 2 moles H2 =4.0 moles H2O If 4.0 moles of hydrogen gas and 1.0 mole of oxygen gas are reacted, how many grams of water will be produced? 4.0 moles H2 2 moles H2O 2 moles H2 =4.0 moles H2O 1.0 moles O2

Practice Problem 1 1 mol O2 4.0 moles H2 2 moles H2O 2 moles H2 If 4.0 moles of hydrogen gas and 1.0 mole of oxygen gas are reacted, how many grams of water will be produced? 4.0 moles H2 2 moles H2O 2 moles H2 = 4.0 moles H2O 1.0 moles O2 2 moles H2O 1 mol O2

Practice Problem 1 1 mol O2 4.0 moles H2 2 moles H2O 2 moles H2 If 4.0 moles of hydrogen gas and 1.0 mole of oxygen gas are reacted, how many grams of water will be produced? 4.0 moles H2 2 moles H2O 2 moles H2 = 4.0 moles H2O 1.0 moles O2 2 moles H2O 1 mol O2 = 2.0 moles H2O

Practice Problem 1 2.0 moles H2O If 4.0 moles of hydrogen gas and 1.0 mole of oxygen gas are reacted, how many grams of water will be produced? 2.0 moles H2O

Practice Problem 1 2.0 moles H2O 18.0 g H2O 1 mol H2O If 4.0 moles of hydrogen gas and 1.0 mole of oxygen gas are reacted, how many grams of water will be produced? 2.0 moles H2O 18.0 g H2O 1 mol H2O

Practice Problem 1 = 36 g H2O 2.0 moles H2O 18.0 g H2O 1 mol H2O If 4.0 moles of hydrogen gas and 1.0 mole of oxygen gas are reacted, how many grams of water will be produced? 2.0 moles H2O 18.0 g H2O 1 mol H2O = 36 g H2O

Practice Problem 2 When 87.0 grams of aluminum reacts with 402 grams of hydrobromic acid, how many liters of hydrogen gas are formed?

= 4.83 mol H2 = 2.48 mol H2 = 55.6 L H2 87.0 g Al 1 mol Al 3 mol H2 402 g HBr 1 mol HBr 3 mol H2 80.9 g HBr 6 mol HBr = 2.48 mol H2 2.48 mol H2 22.4 L H2 1 mol H2 = 55.6 L H2

Questions? Concerns?