STEPS
What do the coefficients of a balanced chemical equation tell you?
The mole Ratio
3H2 + N2 --> 2NH3
How many moles of Nitrogen (N2) are needed to make 9 moles of ammonia (NH3)
4.5 moles N2
It takes 3 wheels and 1 frame to make a tricycle.
If you have 9 wheels and 4 frames, how many tricycles can you make? What is the limiting reactant? How much excess reactant is left over?
3 tricycles
wheels = limiting reactant
1 frame left over
Write the empirical formula for a compound with the Molecular formula C4H8O2
C2H4O
What is the formula for % Yield?
Experimental/Theoretical * 100
Outline the process of converting from Moles of one substance to moles of another substance
Moles A x Coeff Moles B
Coeff Moles A
3H2 + N2 --> 2NH3
What mass of Hydrogen (H2) is needed to react completely with 10 moles of Nitrogen (N2)
60 g H2
2Al + 3Cl2 --> 2AlCl3
If 7 moles of chlorine (Cl2) react with 4.5 mol of aluminum (Al) how many moles of Aluminum chloride (AlCl3) will be produced?
4.5 mol AlCl3
The molar mass of a compound with the empirical formula CH2O is 180g/mol. Find the Molecular Formula
C6H12O6
If a student produces 60g of a product in an experiment that should have produced 200g. What is the percent yield?
30%
Outline the process of converting from grams of a substance to moles of a substance
Grams A x 1 Mole A
PT g A
3H2 + N2 --> 2NH3
What mass of Nitrogen (N2) is needed to make 340g of Ammonia (NH3)?
280 g N2
2Al + 3Cl2 --> 2AlCl3
What mass of AlCl3 will be produced from reacting 8 mol Cl2 with 5 mol Al?
What is the limiting reactant?
666.75 g AlCl3
Al Limiting reactant
A compound is 67.31% Carbon, 6.96% H, 4.62% N and 21.1% O. What is the empirical formula?
C17H21NO4
2H2 + O2 --> 2H2O
If 4 moles are produced from reacting 16 moles of Hydrogen, what is the percent yeild?
25%
Outline the process of converting from grams of a substance to grams of another substance
? g A x 1 mole A x Coeff mol B x PT g B
Pt g A Coeff mol A 1 mol B3H2 + N2 --> 2NH3
What mass of Hydrogen (H2) is needed to react with 224 g Nitrogen (N2)?
48 g H2
2Al + 3Cl2 --> 2AlCl3
How many moles of AlCl3 will be produced from 243g of Al?
If you have 14 moles of Cl2 do you have enough to completely react with the 243 g of Al?
9 moles produced
Yes, you need 13.5 moles Cl2
A compound is 37% Carbon, 2.22% Hydrogen, 18.5% Nitrogen and 42.27% Oxygen. Determine the Empirical Formula
C7H5N3O6
2H2 + O2 --> 2H2O
If 120g of water are produced from reacting 16g of Hydrogen, what is the percent yield?
83%
If you are given grams in the question, what is the first step?
Take it to Moles
Fe+O2--->Fe2O3
Find the mole ratio of Iron to Oxygen
4:3
2Al + 3Cl2 --> 2AlCl3
What mass of AlCl3 will be produced from reacting 354.5 g Cl2 with 135 g Al?
What is the limiting reactant?
434.5 g AlCl3
Cl2 Limiting reactant
A compound made of Hydrogen and Oxygen is 5.88% H with a Molar mass of 34g/mol. Find the Molecular formula.
H2O2
2H2 + O2 --> 2H2O
If 57.6g of H2O are produced from reacting 20g of Hydrogen with 64g of Oxygen, what is the percent yield?
80%