Dimenensional Analysis
Molar Masses
Stochiometry
Limiting Reactant - % Yield
100
The density (mass/volume) of aluminum is 2.70 x 10,000 kilograms per meter (kg/m3). What is the mass of an aluminum cylinder that has a volume of 1.50 m3?
What is 4.05 x 10,000 kg?
100
How was Avogadro’s number determined?
What is determined by the number of atoms in 12.00 g of carbon-12?
100
The equation below shows lithium reacting with nitrogen to produce lithium nitride.
6Li + N2 
2Li3N
If 12 mol of lithium were reacted with excess nitrogen gas, how many moles of lithium nitride would be produced?
What is 4.0 mol?
100
What describes the actual yield and theoretical yield of a reaction?
What is the actual yield depends on the reaction conditions, but the theoretical yield varies only with reactant amounts.
200
A year has 365 days, and a day has 24 hours. If an hour has 60 minutes and a minute has 60 seconds, how many seconds are there in 1 year?
What is 3.15 x 107 s?
200
What must be the same when comparing 1 mol of oxygen gas, O2, with 1 mol of carbon monoxide gas, CO?
What is the number of molecules?
200
The balanced equation below shows the products that are formed when pentane (C5H12) is combusted.
C5H12 + 8O2 
10CO2 + 6H2O
What is the mole ratio of oxygen to pentane?
What is 8:1?
200
Consider the chemical equation.
2NBr3 + 3NaOH 
N2 + 3NaBr + 3HOBr
If there are 40 mol of NBr3 and 48 mol of NaOH, what is the excess reactant?
What is NBr3?
300
What expression is equal to the number of grams (g) in 2.43 kilograms (kg)?
What is 
300
The following balanced equation shows the formation of ammonia.
N2 + 3H2 
2NH3
How many moles of nitrogen are needed to completely convert 6.34 mol of hydrogen?
What is 2.11 mol?
300
Copper metal (Cu) reacts with silver nitrate (AgNO3) in aqueous solution to form Ag and Cu(NO3)2. An excess of AgNO3 is present. The balanced chemical equation is shown below.
Cu + 2AgNO3 
Cu(NO3)2 + 2Ag
The molar mass of Cu is 63.5 g/mol. The molar mass of Ag is 107.9 g/mol. What mass, in grams, of Ag is produced from reaction of 31.75 g of Cu?
What is 107.9?
300
Consider the balanced equation below.
2H2S + 3O2 
2SO2 + 2H2O What is the correct mole ratios of H2S:S02 and O2:H20?
What is 2 H2S : 2 S02 and 3 O2 : 2 H20?
400
A teacher wants to figure out the amount of a solution that is needed for a titration experiment in a class lab. The class has 15 students, and each experiment needs 50 mL of solution.
If each student will perform the experiment two times, how many mL of solution will the teacher need for the whole class?
What is 1500 mL?
400
The chemical equation below shows the combustion of propane (C3H8).
C3H8 + 5O2 
3CO2 + 4H2O
The molar mass of oxygen gas (O2) is 32.00 g/mol. The molar mass of C3H8 is 44.1 g/mol. What mass of O2, in grams, is required to completely react with 0.025 g C3H8?
What is .091?
400
A sample of calcium oxide (CaO) has a mass of 2.80 g. The molar mass of CaO is 56.08 g/mol. How many moles of CaO does this sample contain?
What is .0499?
400
Consider the chemical equation.
2H2 + O2 
2H2O
What is the percent yield of H2O if 87.0 g of H2O is produced by combining 95.0 g of O2 and 11.0 g of H2?
Use 
What is 88.5%?
500
The volume of a sample of water is 2.5 milliliters (mL). What is the volume of this sample in liters (L)?
What is 2.5 x 10–3 L?
500
What is the molar mass of fluorine, F2?
What is 38.00 g/mol?
500
A sample of sodium hydroxide (NaOH) has a mass of 160.0 g. The molar mass of NaOH is 40.00 g/mol. How many moles of NaOH does this sample contain?
What is 4.000?
500
he equation shows the reaction between zinc metal and hydrochloric acid.
Zn(s) + 2HCl(aq) 
ZnCl2(aq) + H2(g)
What is the theoretical yield of hydrogen gas if 5.00 mol of zinc are added to an excess of hydrochloric acid?
What is 10.1 grams of H2?