STEPS
The first step you take when doing stoichiometry.
What is write the balanced equation? (or make sure the equation is balanced)
When you convert moles to moles, you are trying to find...
What is the Mole Ratio?
Mass relationships between substances in a chemical reaction.
What is Stoichiometry?
Calculate the molecular mass (AKA molar mass or formula mass) of KCl
What is 74.55 g/mol?
Fe3O4 + 4 CO--->3 Fe + 4 CO2
How many moles of CO are needed to react with 16.5 g of Fe3O4?
What is 0.285 moles CO?
The second step you take in stoichiometry.
What is use the molar mass of your given substance to convert between grams and moles (if required).
When you convert moles to grams, you are using the...
What is Molar Mass?
What we look at to find mole ratios.
What are the coefficients in a balanced equation?
Avogadro's number
What is 6.02x1023?
2 Fe2O3 ------> 4 Fe + 3 O2
How many moles of Fe2O3 will form from 12.0 moles of Fe?
What is 6 moles Fe2O3?
The third step you take in stoichiometry.
What is use the mole ratio from the balanced equation to calculate the moles of your unknown substance?
For the combustion of methane:
CH4+2O2→CO2+2H2O
If you have 4 moles of oxygen gas, how many moles of water will be produced?
What is 4 moles of H2O?
How do we determine the gram-per-mole (g/mol) value of an atom? (the molar mass)
What is use the atomic mass on the periodic table?
How we convert moles to grams
What is multiply by molar mass?
2 KClO3 -------> 3 O2 + 2 KCl
How many moles of KClO3 must decompose in order to produce 7 moles of oxygen gas?
What is 4.6 moles KClO3?
The last step in stoichiometry.
What is convert from moles of your unknown substance to another unit (grams, molecules) if required?
A balanced chemical equation for the combustion of propane is:
C3H8+O2→CO2+H2O
What is C3H8 + 5 O2 → 3 CO2 + 4 H2O?
The reaction between magnesium (Mg) and oxygen (O₂) to form magnesium oxide (MgO) is what type of chemical reaction?
Combination (Synthesis) Reaction
What are you calculating for if you divide by 6.022x10^23 then multiply by molar mass?
What is converting from particles to grams?
2 Na + Cl2 -------> 2 NaCl
How many grams of NaCl will be produced from 7.25 mol of chlorine gas reacting with sodium?
841 g
Something you could use to help you with the stoichiometry process.
What is label and use only the needed information (i.e values)?
Fe+O2--->Fe2O3
Find the mole ratio of Iron to Oxygen
What is 4:3?
In a chemical reaction, there may be multiple reactants. When one of those runs out, we call that this?
What is the limiting reactant?
How many atoms are in 1 gram of hydrogen? approx...
What is 6.02 × 1023 ?
NH4NO3 -------> N2O + 2 H2O
Ammonium nitrate decomposes into dinitrogen monoxide gas and water. Determine the amount in grams of water produced if 15.0 g of ammonium nitrate decomposes.
6.75 g H2O