Chapter 9
Chemical Quantities
- A balance chemical equation gives relative numbers (or mole) of reactant and product
molecules that participate in a chemical reaction
- The coefficients of a balanced equation give the relative numbers of molecules
Mole Ratio
- allow us to convert from moles of one substance in a
balanced equation to moles of a second substance in
the equation
Stoichiometry
Steps for calculating the mass of reactants and products in
chemical reactions:
1. Balance the equation**
2. Convert the mass of reactants or products to mole
3. Use the balanced equation to set up the appropriate mole ratio
4. Use the mole ratio to calculate the number of moles of the desired reactant or
product
5. Convert from moles back to masses
Stoichiometric Mixture
Contain the relative amounts of reactants that matches the numbers in the balanced equation
Limiting Reactant Mixture
- When there is not enough reactant -> we called it the
limiting
o Causing less in the product
- Steps to solving Stoichiometry problem involving limiting
reactant:
1. Write the balance equation for the reaction
2. Convert known masses of reactants to moles
3. Using the numbers of moles of reactants and
the appropriate mole ratios, determine which reactant is limiting
4. Using the amount of the limiting reactant and the appropriate mole ratios,
compute the number of moles of the desired product
5. Convert from moles of product to grams of product using the molar mass
Chemical Quantities
- A balance chemical equation gives relative numbers (or mole) of reactant and product
molecules that participate in a chemical reaction
- The coefficients of a balanced equation give the relative numbers of molecules
Mole Ratio
- allow us to convert from moles of one substance in a
balanced equation to moles of a second substance in
the equation
Stoichiometry
Steps for calculating the mass of reactants and products in
chemical reactions:
1. Balance the equation**
2. Convert the mass of reactants or products to mole
3. Use the balanced equation to set up the appropriate mole ratio
4. Use the mole ratio to calculate the number of moles of the desired reactant or
product
5. Convert from moles back to masses
Stoichiometric Mixture
Contain the relative amounts of reactants that matches the numbers in the balanced equation
Limiting Reactant Mixture
- When there is not enough reactant -> we called it the
limiting
o Causing less in the product
- Steps to solving Stoichiometry problem involving limiting
reactant:
1. Write the balance equation for the reaction
2. Convert known masses of reactants to moles
3. Using the numbers of moles of reactants and
the appropriate mole ratios, determine which reactant is limiting
4. Using the amount of the limiting reactant and the appropriate mole ratios,
compute the number of moles of the desired product
5. Convert from moles of product to grams of product using the molar mass
