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Terms
Limiting Reactant Problems
Gas Stoichiometry Problems
Stoichiometry Practice
Mole/Mole and Mole/Mass Problems
100
The calculations of quantities in a chemical reaction.
What is stoichiometry?
100
15 g of copper (II) chloride react with 20 g of sodium nitrate, what is the limiting reagent? Hints: -We have .11 mol CuCl2 and .24 mol NaNO3 -We need .22 mol NaNO3 and .12 mol CuCl2
What is CuCl2?
100
Calculate the number of moles contained in 550 mL of carbon dioxide at STP. Hints: -First convert 550 mL to liters -End up with .55L -Use 22.4 L in your conversion factor
What is 0.0246 mol?
100
Balance the following equation NaOH + H2SO4 --> H2O + Na2SO4
What is 2NaOH+H2SO4 --> 2H2O + Na2SO4?
100
Refer to the following equation: 4NH3 (g) + 5O2 (g) --> 4NO(g) + 6H2O (G) How many moles of NO are formed if 824 g of NH3 react? Hints: -2 conversion factors -Molar mass of NH3 is 17 g
What is 48.47 mol NO?
200
The reactant that runs out first in a reaction
What is the limiting reactant?
200
I have 25.0 g of lead (II) nitrate and 15.0 g of sodium iodide. In order to find the limiting reagent, what is the first step?
What is convert 25.0 g of lead (II) nitrate and 15.0 g of sodium iodide to moles?
200
Calculate the mass of 1.50 L of CH4 at STP. Hints: -There will be 2 conversion factors -Use 22.4 L in your first conversion factor -Molar mass of CH4 is 16 g (use this in second conversion factor)
What is 1.07 g?
200
How many moles of water will be formed if you start with 2.54 moles of sodium hydroxide and you have an excess of sulfuric acid? Hint: -Refer to the following equation: 2NaOH + H2SO4 --> 2H2O + Na2SO4 -Sodium hydroxide is NaOH
What is 2.54 mol H2O?
200
4NH3(g) + 5O2 (g) --> 4NO (g) + 6H2O (g) What is the first conversion factor that will be used in finding how many grams of water are formed if 2.5 moles of ammonia are oxidized? *Hints* -Start with 2.5 mol NH3
What is ( 6 mol H2O / 4 mol NH3 ) ?
300
The reactant still left over in a chemical reaction
What is the excess reactant?
300
Consider the following reaction: 2Al + 6HBr -> 2AlBr3+3H2. When 3.22 moles of Al react with 4.96 moles of HBr, how many moles of H2 are formed? Hints: -HBr is limiting - Use the conversion factor of ( 3 mol H2 / 6 mol HBr ) to cancel out mol HBr and end up with mol H2.
What is 2.48 mol H2?
300
Calculate the volume in liters of 50.0 grams of nitrogen dioxide at STP. Hints: -There will be two conversion factors -Use 22.4 L in one conversion factor -Molar mass of NO2 is 46g
What is 24.3L?
300
Refer to the following equation: 2NaOH + H2SO4 --> 2H2O + Na2SO4 How many moles of sodium sulfate (Na2SO4) will be formed if you start with 5.00 moles of sodium hydroxide? Hints: -Use Na2SO4 and Na2OH in conversion factor
What is 2.5 mol Na2SO4?
300
Refer to the following equation: 2HGO --> 2Hg + O2 What is the conversion factor that will be used when determining how many moles of mercury are produced if 24.5 moles of mercury (II) oxide decompose? *Hints* -Start with 24.5 moles HgO
What is (2 mol Hg / 2 mol HgO)?
400
The amount of substance that forms when the reaction is carried out in the lab. *HINT* (Often less than the theoretical yield)
What is the actual yield?
400
Consider the following reaction: 3Si + 2N2 --> Si3N4 When 21.44 moles of Si reacts with 17.62 moles of N2, how many moles of Si3n4 are formed? Hints: - Si is limiting so use the conversion factor ( 1 mol Si3N4 / 3 mol Si ) to cancel out mol Si
What is 7.14 mol Si3n4?
400
Given the following reaction: NH4NO2(s) --> N2 (g) + 2H2O (g) How many liters of nitrogen gas is produced if 50.0L of water is produced at STP? Hints: -There will be 3 conversion factors -Use 22.4L in TWO of the conversion factors -Use ( 1 mol N2 / 2 mol N2O)
What is 25.0L?
400
Consider the following equation: 2NaOH + H2SO4 --> 2H2O + Na2SO4 How many moles of sulfuric acid are required to make 4.00 moles of sodium sulfate? Hint: -Use 1 mol H2SO4 and 1 mol NaSO4 in your conversion factor
What is 4 mol sulfuric acid?
400
Balance the following equation: Al + Cl2 --> AlCl3
What is 2Al + 3Cl2 --> 2AlCl3 ?
500
The maximum amount of product that can be formed when calculated
What is the theoretical yield?
500
Consider the following reaction: 2CuCl2 + 4Kl --> 2Cul + 4KCl + I2 When 0.56 moles of CuCl2 reacts with 0.64 moles of Kl, how many moles of I2 are formed? Hints: -Kl is limiting -Use conversion factor of ( 1 mol I2 / 4 mol Kl )
What is .16 mol I2?
500
2Li + 2H2O --> 2LiOH + H2 How many grams of solid lithium must be added to liquid water in order to obtain 15.0 L of hydrogen gas at STP? Hints: -3 conversion factors -Use 22.4 L in one conversion factor Molar mass of Li is 6.9 -Use (2 mol Li / 1 mol H2)
What is 9.2 g?
500
Balance the following equation: Pb(SO4)2 + 4LiNO3 --> Pb(NO3)4 + Li2SO4
What is Pb(SO4)2 + 4LiNO3 --> Pb(NO3)4 + 2Li2SO4?
500
In order to find the mass in grams of hydrogen required to react with 1.34 moles of nitrogen, refer to the following balanced equation : N2 + 3H2 --> 2NH3 *How many conversion factors are needed to solve this problem?*
What is two? (3 H2 mol / 1 mol N2 ) and ( 2g H / 1 H2 mol)