Conceptual
Runs out first
stops reactions from going
In order to convert from one substance to another. what conversion factor must you use?
Mole ratio
Be + 2 HCl 🡪 BeCl2 + H2
How many moles of hydrogen are produced with 15.3 moles of hydrochloric acid?
7.65 mol
What is theoretical yield?
Amount calculated
What you should produce
To make a bacon grilled cheese sandwich, you need 4 strips of bacon, 2 slices of cheese, and 2 slices of bread.
If I have 120 strips of bacon, 60 slices of cheese, and 54 slices of bread , how many sandwiches can i make?
Whats my LR?
27 sandwiches
Bread
What is excess reactant?
Leftovers
Br2 + 2NaI --> 2NaBr + I2
Have: 3.1 moles of NaBr, how much NaI do you need?
3.1 mol NaI
Be + 2 HCl 🡪 BeCl2 + H2
How many grams of beryllium chloride are produced with 2.4 moles of beryllium ?
191.8 grams BeCl2
What does percent yield measure?
How well you perform in the lab
Efficiency
378 grams of Hydrochloric acid combine with combine with 88 grams of oxygen to produce water and chlorine gas. Which is the LR?
HCl
What conversion factor do you use to convert from one substance to another substance?
Mole Ratio
Balance and solve:
Cu + AgNO3 🡪 Ag + Cu(NO3)2
How many moles of silver are produced when 36.92g of copper displaces silver from silver nitrate in the above reaction?
1.162 mol Ag
sodium and fluorine react in a synthesis reaction
How many grams of F2 are used when 3 moles of Na are used?
57 g F2
You have 684 grams C12H22011 . How many grams of C2H5OH are produced? Theoretically, you should produce 368 grams. However, your actual yield is 390 grams of C2H5OH. Determine the % yield
106%
378 grams of Hydrochloric acid combine with combine with 88 grams of oxygen to produce water and chlorine gas. How many grams of water can be produced?
93.4 g
What is actual yield?
What you produced in a experiement
Write the equation and solve:
copper reacts with silver nitrate in a single replacement reaction to produce silver metal and copper (II) nitrate
How many grams of Ag are produced when 1.3 moles of Cu are used?
280 g Ag
Copper reacts with silver nitrate in a single displacement reaction. How many moles of copper (II) nitrate are produced when 27.53g of copper displaces silver from silver nitrate in the above reaction
0.4332 mol
Tungsten (W) can be produced from its oxide by reacting the oxide with hydrogen at a high temperature according to the following equation:
WO3 + 3H2 → W + 3H2O
If 56.9 g of WO3 is used with excess hydrogen gas, what will be the theoretical yield (in moles) of tungsten that can be recovered?
WO3 + H2 --> W + 3H2O
If the actual yield of tungsten is 41.4 g, what is the percent yield of tungsten?
91.76%
378 grams of Hydrochloric acid combine with combine with 88 grams of oxygen to produce water and chlorine gas. How many grams of chlorine can be produced?
368 g
What is the definition of the following:
Stoichiometry
Law of Conservation of Mass
quantitative relationship between reactants and products used in a chemical reaction
matter cant be created nor destroyed
Excess ammonium sulfate reacts with 20.0 g of calcium hydroxide to produce calcium sulfate, ammonia, and water. How many grams of ammonia (NH3) are produced?
9.20 g NH3
Sodium hydroxide reacts with sulfuric acid in a neutralization reaction. The products are water and sodium sulfate. How many grams of sodium hydroxide are needed to completely neutralize 25.0 g of sulfuric acid?
20.39 g NaOH
Manganese(IV) oxide reacts with hydrochloric acid to produce manganese(II) chloride, chlorine, and water. You have 86 grams of MnO2. How many grams of Cl2are produced? Your actual yield is 20.0 grams of Cl2. Determine the % yield
28.5%
Sulfur dioxide can be produced in the laboratory by the reaction of hydrochloric acid and a sulfite salt such as sodium sulfite.
Na2SO3 + 2HCl → 2NaCl + SO2 + H2O
What mass of SO2 can be made from 25.0 g of Na2SO3 and 22.0 g of HCl?
11.3 g SO2
Copper (II) Chloride reacts with sulfuric acid. How many molecules of hydrochloric acid are produced from 31.5 grams of copper (II) chloride?
2.82 x 1023 molecules