Stoichiometry Warmup I have 1 mole of CO 2 gas at STP. How many grams of CO 2 do I have? How many Liters of CO 2 do I have? How many molecules of CO 2.

Stoichiometry Warmup

• I have 1 mole of CO2 gas at STP.

• How many grams of CO2 do I have?

• How many Liters of CO2 do I have?

• How many molecules of CO2 do I have?

Stoichiometry

• The relationship between reactants and products in a balanced chemical equation

• Mole Ratios

Stoichiometry

• If you know the moles of a substance, the balanced equation allows you to determine the moles of all other substances in the rxn

Stoichiometry

• Coefficients from balanced equations can be used to write conversion factors called mole ratios

Stoichiometry

• Write a balanced equation for the following rxn:

• Hydrogen + nitrogen ammonia

Stoichiometry

• How many moles of ammonia are produced when 0.60 mol of nitrogen reacts with hydrogen?

Stoichiometry

• How many moles of hydrogen gas are needed to react with 0.60 mol of nitrogen gas?

Stoichiometry

• How many grams of ammonia are produced by the reaction of 5.40g of hydrogen with excess nitrogen?

Stoichiometry

• How many grams of nitrogen are needed to react with 5.40g of hydrogen?

Stoichiometry

Stoichiometry

• How many molecules of oxygen are produced when 29.2g of water are decomposed?

Limiting vs. Excess Reagents

• Limiting Reagent =The reactant that determines the amount of product formed in a rxn.

• Completely consumed in the rxn.

Limiting vs. Excess Reagents

• Excess Reagent = the reactant that is not completely used up

Limiting vs. Excess Reagents

• If you have 6.70 mole of Na and 3.20 mol Cl2, which is the LR?

• How many moles of NaCl is produced?

• How many moles of ER remain?

Limiting vs. Excess Reagents

• What is the limiting reagent when 80.0g Cu reacts with 25.0g S?

• What is the maximum amount of Cu2S in grams that can be formed?

• How many grams of ER remain?

LR video

• http://education-portal.com/academy/lesson/limiting-reactants-calculating-excess-reactants.html#lesson

Yield Video

• http://education-portal.com/academy/lesson/calculating-reaction-yield-and-percentage-yield-from-a-limiting-reactant.html#lesson

Theoretical Yield

• Theoretical Yield = maximum amount of product that can be formed from given amounts of reactants

• (based on calculation from the LR)

Actual Yield

• Actual Yield = the amount of product formed when the rxn is carried out in the lab

• Based on experimentation

Percent Yield

• Percent Yield = • actual yield / theoretical yield• x 100

Percent Yield

• What is the percent yield of CaO when 24.8g of CaCO3 is heated and 13.1g CaO is produced in the lab?

• CaCO3 CaO + CO2

Stoichiometry Review

What is the LR?

• 4 moles of oxygen gas react with 16 moles of H2 gas.What is the LR?

• What is the theoretical yield of product?

What is the percent yield?

• The burning of 18.0g of carbon in oxygen produces 55.0g of carbon dioxide.

Review Question

• Write a balanced equation for the reaction that occurs when Magnesium metal reacts with Hydrochloric acid.

Review Question

• If 10.0g of Magnesium is mixed with 35.0g of Hydrochloric acid, what is the LR?

Review Question

• What is the theoretical yield of magnesium chloride?

Review Question

• What is the percent yield of Magnesium chloride if 35.0g is produced in the lab?

Review Question

• How much excess reagent remains?