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
What are you calculating if you add the atomic masses of a molecule?
Molar mass
How many grams of CH4 will be needed to react with 3.6 g of O2?
CH4 + O2 --> H2O + CO2
0.90 g
How do you identify the mole ratio 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 55 g of C?
4.58 moles
How many grams of H2 will be needed to produce 2.7 g of H2O?
O2 + H2 --> H2O
0.30 g
How do you write the mole ratio in stoichiometry?
Write the mole ratio with the unknown over the known
How many grams are in one mole of Cu?
63.55 g
How many moles are in 198 g of LiOH?
8.27 moles
C6H12O6 --> C2H5OH + CO2
How many grams of C6H12O6 will you need to produce 15 grams of C2H5OH?
29.3 g
How do you convert moles to grams 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
How many grams are in 2.5 moles of CO2?
110.03 g
How many grams of O2 will be needed to produce 1.7 g of H2O?
O2 + H2 --> H2O
1.5 g
How do you calculate the molar mass of an element/compound for stoichiometry?
Use the atomic mass of the elements from the periodic table.
Fe+O2--->Fe2O3
Find the mole ratio of Iron to Oxygen
4:3
How many grams are in 1.75 moles of H2O?
31.52 g
Na2S2O3 + Cl2 + H2O --> NaHSO4 + HCl
How many grams of H2O are needed to react with 43g of Cl2?
13.66 g