Theory
The part of the stoichiometry problem which represents the relationship between the reactants and products.
What is the ratio?
Cu + 2 AgNO3 --> 2 Ag + Cu(NO3)2 How many grams of silver will be formed from 12.0 g metallic copper?
What is 40.7?
When 11.2 liters of hydrogen gas, at STP, is made by adding zinc to sulfuric acid, what mass of zinc is needed? Zn + H2SO4 --> H2 + ZnSO4
What is 32.7g?
The theoretical yield of a chemical reaction is 32.8g. The actual yield is 27.1g. What is the percent yield?
What is 82.62%?
The amount of product produced from an actual experiment
What is actual yield
What is your conversion factor to use to convert from moles to grams or vise versa?
The molar mass from the periodic table
CO2(g) + 2 LiOH(s) --> Li2CO3(aq) + H2O(l) How many grams of water would be produced by the reaction of 20 moles of CO2?
What is 360?
What is the percent yield if 33.4 g of Na3PO4 produced 19.6 g of AlPO4 when reacted with excess aluminum chloride in solution? Na3PO4 (aq) + AlCl3 (aq) --> 3 NaCl (aq) + AlPO4 (s)
What is 78.9%?
Ethyl cyanide is prepared from ethyl bromide by the reaction: C2H5Br + NaCN --> C2H5CN + NaBr If 8.53 g of NaCN is reacted with 11.0 g of C2H5Br, what mass of C2H5CN will be formed?
What is 5.56 g?
The amount of product that could be made under perfect conditions. You calculate this
What is theoretical yield?
conversion factor for moles to liters at STP
What is 22.4 L per mole?
How many moles of chlorine gas (Cl2) would react with 5 moles of sodium (Na) according to the following chemical equation? 2Na + Cl2 --> 2NaCl
What is 2.5?
What volume of NH3 at STP is needed to add to water to produce 11 moles of NH4OH? The balanced chemical equation is: NH3 + H2O --> NH4OH
What is 246 liters?
CH4 + 2O2 --> CO2 + 2H2O In one experiment, a mixture of 0.250 mol of CH4 was burned in 1.25 mol of O2 in a sealed steel vessel. How many moles of water will be made?
What is 0.5 moles?
Formula for percent yield.
What is (actual / theoretical) x 100?
6.02 x 1023
What is a mole?
In the reaction 2C8H18 + 25O2 --> 16CO2 + 18 H2O, if 27.3g of C8H18 are combusted, what mass of water will be produced?
What is 37.8 g H2O?
How many grams magnesium hydroxide do you need to produce 500 liters of ammonia, at STP? Mg(OH)2 + (NH4)2SO4 --> 2H2O + MgSO4 + 2NH3
What is 651?
In the reaction 2NH3 --> 3H2 + N2, if 12.0 g of NH3 produced 1.87 g of H2, what was the percent yield?
What is 87.6 % yield for H2?
The reactant which runs out first.
What is limiting reactant?
What do the coefficients in a balanced equation represent?
What is moles?
How many moles of nitrogen gas is needed to react with 44.8 liters of hydrogen gas to produce ammonia gas? 3H2 + N2 --> 2NH3
What is 0.667?
Ten grams of calcium carbonate was produced when carbon dioxide was added to calcium hydroxide. What volume of carbon dioxide at STP was needed? CO2 + Ca(OH)2 --> CaCO3 + H2O
What is 2.24 liters?
2 HCl + CaCO3 → CaCl2 + CO2 + H2O 8.57 g of CaCO3 produced 3.11 g of CO2. What was the percent yield?
What is 82.5 %?
How do you solve for the excess reactant?
Use the amount of the limiting reactant that reacted, calculate how much of the excess reactant reacts with it, subtract from what you started with