Stoich Basics
The calculations of quantities in a chemical reaction
What is Stoichiometry?
The most important thing to consider when performing a lab
What is safety?
The reagent that remains left over after the reaction stops
What is the excess reagent?
Equation for percent yield
What is (actual yield/theoretical yield) x 100
2S + 3O2 ---> 2SO3
How much SO3 can be produced from 2.0 mol of O2 and excess S?
1.3 mol SO3
This useful stoichiometry tool has a starting location, an ending location, and a pathway between the two.
What is the mole map?
A laboratory tool used to precisely measure out volumes of liquids
What is a graduated cylinder?
This only occurs until the limiting reagent is used up
What is the chemical reaction?
Ways to get an actual yield
What are performing a lab and/or given in the problem?
How many moles of CO2 are produced during the combustion of 3.0 mol of octane (C8H18)?
2C8H18 + 25O2 ---> 16CO2 + 18H2O
24 mol
A conversion factor derived from the coefficients of a balanced chemical equation interpreted in terms of moles
What is mole ratio?
To separate solids from fluids by adding a medium through which only the fluid can pass
What is filtration?
The reactant that determines the amount of product formed
What is the limiting reagent?
the calculated maximum amount of product formed
What is theoretical yield?
CO + 2H2 ---> CH3OH
If 74g of CO (28g/mol) reacts to produce 69.2g of CH3OH (32g/mol), what is the percent yield of CH3OH?
81.7%
2Al + 6HCl ---> 2AlCl3 + 3H2S
The following numbers tell us the 2:6:2:3....
What is the mole ratio
To tare a scale in order to have the scale read 0.00 g
What is zeroing?
gases at 0 degrees Celsius, 1 atm
What is STP?
Human Error and Scale Error
What are unsuitable reasons for error?
If we mix together 100. g of TiCl4 (188 g/mol) and 5.00g of H2 (2 g/mol), what is the maximum amount of HCl (36 g/mol) that can be produced?
TiCl4 + 2H2 ---> Ti + 4HCl
77.0 grams
Can be interpreted in terms of different quantities, such as molecules or moles.
a balanced chemical equation
To pour off a liquid layer while not disturbing the solid layer of a mixture
What is decanting?
2S + 3O2 ---> 2SO3
Given 40g O2 (32 g/mol) and 30g S (32 g/mol) - O2 is the ______; S is the ________
What is the LR and ER.
The percent yield is found to be 97.3% from a theoretical yield of 9.78 grams. In the lab, you and your lab partner produced an actual yield of this amount.
What is 9.52 grams?
60.0g O2 (32 g/mol) and 50.0g S (32 g/mol) are reacted according to the equation. Which reactant is in excess and by how many grams?
2S + 3O2 ---> 2SO3
S; 10.0g