STEPS
Before starting stoichiometry, what should you do?
Write the balanced equation.
If you have 1 mole of atoms of any element how many atoms do you have?
6.022 x 1023
How many moles are in 55 g of C?
4.58 moles
What is the first step you take in stoichiometry?
Identify the 'known' and 'unknown' information
How much is one mole of atoms of any element?
Molar mass of the element.
How many moles are in 198 g of LiOH?
8.27 moles
What is the second step you take in stoichiometry?
Write the mole ratio with the unknown over the known
How many grams are in one mole of Cu?
63.55 g
What is Avogadro's number?
6.022 x 1023
C6H12O6 --> C2H5OH + CO2
How many grams of C6H12O6 will you need to produce 15 grams of C2H5OH?
29.3 g
What is the third step in stoichiometry?
Use molar mass of the known to convert moles to grams
How many grams are in one mole of CO2?
44.01 g
What are you calculating if you add the atomic masses of a molecule?
Molar mass
How many grams of O2 will be needed to produce from 1.7 g of H2O?
O2 + H2 --> H2O
1.5 g
What is the fourth step of stoichiometry?
Use molar mass of the unknown to convert moles to grams
Fe+O2--->Fe2O3
Find the mole ratio of Iron to Oxygen
4:3
What conversion factor is used to convert moles to grams?
Molar mass
Na2S2O3 + Cl2 + H2O --> NaHSO4 + HCl
How many grams of H2O are needed to react with 43g of Cl2?
13.66 g