Vocabulary
Moles to Moles
Mixed Problems
Mass to Mass
Miscellaneous
100
A conversion factor that relates the amounts in moles of any two substances involved in a chemical reaction.
What is mole ratio?
100
CO2 + 2LiOH --> Li2CO3 + H2O How many moles of lithium hydroxide are required to react with 20 mol of CO2?
What is 40 mol LiOH?
100
Mg + 2HCl --> MgCl2 + H2 How many grams of hydrogen will be produced if we start with 2 moles of hydrochloric acid and excess magnesium?
What is 2 g H2?
100

Mg + 2HCl --> MgCl2 + H2 What mass of hydrogen is produced from the reaction of 75 g HCl (MM=36.5 g/mol) and excess Mg?

What is 2.0 g H2?

100
N2 + 3H2 --> 2NH3 In the reaction above, a student reacted 28 g of nitrogen with an excess of hydrogen. According to the students measurements, the reaction produced 30 g of product. The theoretical yield was 34 g. What is the student's percent yield?
What is 88%?
200
The measured amount of product obtained after performing a chemical reaction.
What is actual yield?
200
6CO2 +6H2O --> C6H12O6 + 6O2 How many moles of carbon dioxide are needed to react with 3.25 mol of water in the reaction described above?
What is 3.25 mol CO2?
200
Mg + 2HCl --> MgCl2 + H2 What mass of hydrochloric acid (MM=36.5 g/mol) is needed to react with 2.50 moles of magnesium?
What is 182 g HCl?
200

2KClO3 --> 2KCl + 3O2 

How many grams of KCl are produced if 5.0 g of KClO3 is decomposed?

What is 3 g KCl?

200
Avogadro's number.
What is 6.022 x 10^23?
300
The reactant that determines the amounts of the other reactants that can combine--and the amount of product that can form--in a chemical reaction.
What is the limiting reactant?
300
2Mg +O2 --> 2MgO How many moles of magnesium oxide are produced from 1.2 moles of magnesium?
What is 1.2 mol MgO?
300

How many moles of aluminum atoms are needed to combine with 1.58 mol of oxygen molecules to make aluminum oxide? (4Al + 3O2 --> 2Al2O3)

What is 2.1 mol Al?

300

2Na + Cl2 --> 2NaCl (NaCl MM=58.5 g/mol). Determine the amount of product that can be produced from 24.7 g of sodium and excess chlorine.

What is 62 g NaCl?

300
How many moles are present in 34 grams of Cu(OH)2?
What is 0.35 mol Cu(OH)2?
400
The ratio of the actual yield to the theoretical yield, multiplied by 100.
What is percent yield?
400
Ammonia, NH3, is widely used as a fertilizer and in many household cleaners. How many moles of ammonia are produced when 6 mol of hydrogen gas react with an excess of nitrogen gas?
What is 4 mol NH3?
400

Ammonia (NH3) decomposes to produce N2 and H2. How many moles of H2 can be formed by the decomposition of 0.145 moles of ammonia?

2NH3 --> N2 + 3H2

What is 0.218 mol H2?

400

2NaOH + H2SO4 --> H2O + Na2SO4

Convert 200 g NaOH (MM = 40/gmol) into grams of Na2SO4 (MM = 124 g/mol)

What is 310 g Na2SO4?

400

2KClO₃ → 2KCl + 3O₂

If 24.5 g of KClO₃ decomposes, how many grams of oxygen gas (O₂) are produced?

(Molar masses: KClO₃ = 122.5 g/mol, O₂ = 32.0 g/mol)

24.5 g ÷ 122.5 g/mol = 0.200 mol KClO₃
0.200 mol × (3 mol O₂ / 2 mol KClO₃) = 0.300 mol O₂
0.300 mol × 32.0 g/mol = 9.6 g O₂

500
States that mass is neither created nor destroyed during ordinary chemical or physical reactions. (This is why we balance chemical equations!)
What is the law of conservation of mass?
500
Hydrogen and oxygen gases react under a specific set of conditions to produce water. How many moles of oxygen would be required to produce 5.0 moles of water?
What is 2.5 mol O2?
500

Al2O3 + 2Fe --> Fe2O3 + 2Al

Determine with limiting reactant when 5 moles of aluminum oxide reacts with 7 moles of iron.

What is iron?

500

CuCl₂ + 2NaNO₃ → Cu(NO₃)₂ + 2NaCl

If you start with 15 g of CuCl₂ and 20 g of NaNO₃, how many grams of NaCl can be produced?

(Molar masses: CuCl₂ = 134.5 g/mol, NaNO₃ = 85 g/mol, NaCl = 58.5 g/mol)

What is 13.0 g NaCl?

500

Chlorine gas reacts with potassium bromide to produce potassium chloride and bromine gas. How many grams of potassium chloride can be produced from 300. g each of chlorine and potassium bromide?

What is 188 g KCl?

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