1. Stoichiometry
Lesson 1

2. Bronze Era Before 1500 BC

3. Iron Era after 1500 BC

4. Balanced chemical equations can be used to relate the amounts of reactants and products in chemical reactions.
2Fe2O3 + 3C → 4Fe + 3CO2
The coefficients mean that 2 moles of Fe2O3 react with 3 moles of C to produce 4 moles of Fe and 3 moles of CO2.
The coefficients are a chemical recipe that describes the exact amounts of reactants required to make exact amounts of products in moles.

5. 1. How many grams Fe2O3 of are required to produce 105 g of Fe?
Fe2O3 + 3C → Fe + 3CO2 4 ?g
105 g
105 g Fe
x 1 mole
x 2 mole Fe2O3
x g
= g
55.8 g
4 mole Fe
1 mole

6. 2. How many grams of C are require to consume 155 g of Fe2O3?
Fe2O3 + C → 4 Fe + 3 CO2 2 3
155 g
? g
155 g Fe2O3
x 1 mole
x 3 mole C
x g
= g
159.6 g
2 mole Fe2O3
1 mole

7. 3. How many grams of Al2(CO3)3 are produced by the complete
3. How many grams of Al2(CO3)3 are produced by the complete reaction of 452 g of Al(NO3)3?
Al(NO3) Na2CO3 → Al2(CO3) NaNO3 2 1
452 g
? g
452 g Al(NO3)3
x 1 mole
x 1 mole Al2(CO3)3
x g
= g
213.0 g
2 mole Al(NO3)3
1 mole

8. 4. How many moles of Na2CO3 are required to completely
4. How many moles of Na2CO3 are required to completely consume 152 g of Al(NO3)3?
Al(NO3) Na2CO3 → Al2(CO3) NaNO3 2 3
152 g
? moles
152 g Al(NO3)3
x 1 mole
x 3 mole Na2CO3
= moles
213.0 g
2 mole Al(NO3)3