Student will learn: mole stoichiometry problems

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Presentation transcript:

Student will learn: mole stoichiometry problems mass stoichiometry problems volume stoichiometry problems How to determine amount of reactants or amount produced when given a chemical reaction. Ws. 10.0, 10.1, 10.2, 10.3, 10.4

Five Steps to solving Stoichiometry problems 1. Write correct formulas, balanced chemical equations Identify the given and unknown quantities. “Whatever units given in problem must be converted into Moles.” Use the coefficients to “set up mole ratios” 4. After solving the problem convert quantities to whatever units are required. ( typical grams). 5. Check that your answer is reasonable. Are the units correct?

How many moles of ammonia will be produced if 5 mol nitrogen react? First item to learn is mole ratio ws. 10.0 N2 + 3H2 2NH3 How many moles of ammonia will be produced if 5 mol nitrogen react? How many moles of ammonia will be produced if 4 mol hydrogen reacts? 3, How many moles of nitrogen are required to react with 3.5 mol of hydrogen?

2H2 + O2 2H2O 4. How many moles of water are produced when 3 mol of oxygen are used? 5. If 4 mol of water are produced, how many moles of oxygen must be consumed? 6. How many moles of oxygen are required to react with 5 moles of hydrogen?

Remember: working problems everything must be in moles. Ws. 10.1 1)If 72.0 grams of O2 are reacted, how many grams of ammonia will be combusted? 4NH3 + 5O2 4NO + 6H2O

2)Given 55.0grams of iron (IV) sulfide, how many grams of iron III oxide are produced? 4FeS2 + 11O2 2Fe2O3 + 8SO2

If you react 120g of aluminum chloride with Calcium how many grams of Al are produced? 2AlCl3 + 3Ca 3CaCl2 + 2 Al

How many grams of aluminum oxide will be formed from 100g of Al? 4Al + 3O2 2Al2O3

Ws.10.2 Calculate mass in grams of each reactant/product. 1. A Chemist wants to produce 15g of the precipitant Barium Oxide. How much of Barium Nitrate and Sodium Oxide must be mixed? Calculate the amount that will stay in solution after mixing.

2. Sodium and Iron III Bromide under goes a single replacement reaction. Calculate the amount of each chemical if one uses 25.0 grams of Sodium.

3. Phosphoric acid is poured onto Copper II Hydroxide 3. Phosphoric acid is poured onto Copper II Hydroxide. It goes thru an acid base reaction. If 50mL of water is produced how much of each chemical can be calculated?

Mole conversion for gases One mole of any gas….occupies a volume of 22.4 liters. 1mol 22.4liters At STP….273K….1ATM

4. A car uses 5 gallons of gas (C8H18) on a trip 4. A car uses 5 gallons of gas (C8H18) on a trip. Calculate the amount of liters of oxygen required for combustion and the amount in liters of each exhaust. (1gallon=7.6lbs) (l lbs.=453.59g)

Calculate the mass of sugar required to produce 1 Calculate the mass of sugar required to produce 1.82L of carbon dioxide gas at STP from the reaction and the amount of oxygen in liters needed for combustion. C6H12O6 + 4O2 6H6O + 4CO2 + 2C

How many liters of oxygen are necessary for the combustion of 425g of sulfur? S8 + 8O2 8SO2

Air bags in a car inflate on impact Air bags in a car inflate on impact. 52L of nitrogen is needed to inflate the bag. How many grams of Sodium Azide is needed to be installed in the steering wheel capsule? 2NaN3 2Na + 3N2

Student will learn: mole stoichiometry problems mass stoichiometry problems volume stoichiometry problems How to determine amount of reactants or amount produced when given a chemical reaction. Ws. 10.0, 10.1, 10.2, 10.3, 10.4