Mole-Mole
2Mg +O2 --> 2MgO How many moles of magnesium oxide are produced from 1.2 moles of magnesium?
1.2 mol MgO
Mg + 2HCl --> MgCl2 + H2 How many grams of hydrogen will be produced if we start with 2 moles of hydrochloric acid and excess magnesium?
2 g H2
What is an excess reactant?
The reactant not completely used up in a reaction
Should the actual yield or theoretical yield be greater? Briefly explain why?
Theoretical. We can never make more of a product than what is theoretically possible.
Why is the limiting reactant important to determine in a chemical reaction?
It limits the reaction and helps us determine the amount of product produced
CO2 + 2LiOH --> Li2CO3 + H2O How many moles of lithium hydroxide are required to react with 20 mol of CO2?
40 mol LiOH
Mg + 2HCl --> MgCl2 + H2 What mass of hydrochloric acid (MM=36.5 g/mol) is needed to react with 2.50 moles of magnesium?
182 g HCl
CHCl3 + Cl2 --> CCl4 + HCl
In an experiment 2.50 mol of chloroform and 3.0 mol of chlorine were mixed. How much CCl4 was produced (in moles)
2.50 mol
If the actual yield of a reaction is 35.6 grams and the theoretical yield is 40 grams, calculate the percent yield.
89%
What do we call the measured amount of product obtained after performing a chemical reaction?
Actual yield
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?
3.25 mol CO2
2Na + Cl2 --> 2NaCl
Sodium and chlorine react to produce sodium chloride (table salt; MM=58.5 g/mol). Determine the mass of product that can be produced from 4.50 mol of sodium and excess chlorine.
263 g NaCl
C12H22O11 + 12O2 ---> 12CO2 + 11H2O
For the combustion of sucrose, there are 10.0 mol of sucrose and 10.0 mol of oxygen reacting. Which is the limiting reagent?
Oxygen
For the balanced equation shown below, if the reaction of 91.3 grams of C3H6 produces a 232 g CO2, what is the percent yield? 2C3H6 +9O2 --> 6CO2+6H2O
81.3%
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?
4 mol NH3
2NaOH + H2SO4 --> Na2SO4 + 2H2O
Sodium hydroxide reacts with sulfuric acid (H2SO4; MM=98.1 g/mol) to form water and sodium sulfate. How many grams of sodium sulfate (MM=124 g/mol) will be formed from 200 g NaOH (MM=40 g/mol) and an excess of sulfuric acid?
310 g Na2SO4
2Cu+O2 --> 2CuO
8.0 mol Cu and 5.0 mol of O2 react. How much excess reactant is leftover (in grams)?
1.0 mol O2 leftover
4Rb + O2 → 2Rb2O
Determine the percent yield for the reaction between 10.0 moles of Rb and 2.0 moles of O2 if 3.25 moles of Rb2O is produced.
81.25%
Write the complete balanced equation for the following reaction (include states): When lithium hydroxide pellets are added to a solution of sulfuric acid, lithium sulfate and water are formed.
2LiOH (s) + H2SO4 (aq) --> Li2SO4 (aq) + 2H2O (l)
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?
2.5 mol O2
When copper (II) chloride reacts with sodium nitrate, copper (II) nitrate and sodium chloride are formed. If 15 g CuCl2 (MM=134.5 g/mol) react with 20 g NaNO3 (MM=85 g/mol), how much sodium chloride (MM = 58.5 g/mol) can be formed?
13.0 g NaCl
5.0 moles aluminum oxide react with 7.0 mol iron to form Fe3O4 and Aluminum. How many moles of excess reactant will be leftover?
1.9 mol Al
Determine the percent yield of the reaction if 20.7 grams of CaCO3 decompose to produce 6.81 grams of CaO.
CaCO3-->CaO+CO2
58.7%
____Al2O3 --> ____Al + ____ O2
How many grams of Al2O3 decomposed if 81.0 grams of Al are formed?
153 g Al2O3