The part of the stoichiometry problem which represents the relationship between the given and unknown chemicals.
What is the molar ratio?
100
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?
100
When 11.2 liters of hydrogen gas, at STP, is made by adding zinc to sulfuric acid, what mass of zinc is needed?
Zn + H2 SO4 --> H2 + ZnSO4
What is 32.7g?
100
The theoretical yield of a chemical reaction is 32.8g. The actual yield is 27.1g. What is the percent yield?
What is 1382.6%?
100
THE AMOUNT OF PRODUCT MADE IN A REACTION.
What is actual yield
200
Formula for copper sulfate pentahydrate.
What is CuSO4.5H20?
200
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?
200
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%?
200
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?
200
The amount of product that could be made under perfect conditions.
What is theoretical yield?
300
conversion factor for moles to liters at STP
What is 22.4 L per mole?
300
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?
300
What volume of NH3 at STP is needed to add to water to produce 11 moles of NH4OH?
The balanced chemical equation is:
NH3 + H2 O --> NH4 OH
What is 246 liters?
300
CH4 + 2 O2 ------> CO2 + 2 H2O
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?
300
Formula for percent yield.
What is actual divided by theoretical times 100?
400
6.02 x 1023
What is a mole?
400
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?
400
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?
400
In the reaction 2 NH3 --> 3 H2 + 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?
400
The reagent which runs out first.
What is limiting reagent?
500
What do the coefficients in a balanced equation represent?
What is moles?
500
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?
500
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?
500
2 HCl + CaCO3 → CaCl2 + CO2 + H2O
8.57 g of CaCO3 produced 3.11 g of CO2. What was the percent yield?