More Chemical Quantities

Percent Composition

• Find the mass of each component.
• Divide the mass by the total mass of the compound and multiply by 100 to get the percent composition.

Stoichiometry

• Means the calculations of quantities based on balanced equations.
• The coefficients in an equation represent the number of moles so it is important that they are balanced.

Law of Conservation

• The Law of Conservation of Mass states that mass is neither created or destroyed, it's always conserved.
• Mass and atoms are always conserved, but moles and particles don't have to be conserved.

Mole Ratio

• Coefficients in a balanced equation are used for mole ratios
• Mole ratios are used to convert a compound or element into a different compound or element
• This is how you can find the volume of one compound using the mass of an element in the same equation.

Limiting Reactant

• The limiting reactant limits how much product is produced.
• The limiting reactant is reactant that has the less amount, making all the other reactants in excess.

Types of Yields

• Actual Yield - what was produced in reaction
• Theoretical Yield - what should have been made
• Percent Yield - how efficient your reaction was

Yields

• Percent Yield = Actual Yield / Theoretical Yield
• Percent Yield should be less than 100% - the Actual Yield should be less than the Theoretical Yiel