KEY CONCEPT
A mole is the number of carbon atoms in exactly 12 grams of carbon-12.
6.02 x 10^23 is called Avogadro's number.
STANDARD TEMPERATURE AND PRESSURE
Two things affect the volume of a gas temperature and pressure.
Standard temperature and pressure is O degrees Celcius and 1 atm Pressure.
1 mole = 22.4 L of any gas at STP
1 mole = 6.02 x 10^23 representative particles
STOICHIOMETRY
Stoichiometry is greek for measuring elements.
The calculations of quantities in chemical reactions is based on balanced equations.
Balanced equations can be used to determine how much of one substance would be needed or produced from another substance in the equation.
THE SIGNIFICANCE OF A BALANCED EQUATION
When an equation is balanced, the coefficient numbers represent numbers of moles or particles. (atoms, molecules, or formula units.)
As long as the coefficient numbers remain proportional, the equation remains balanced.
IN TERMS OF MOLES
The coefficients tell us how many moles of each substance.
IN TERMS OF MASS
The Law of Conservation of Mass applies- mass is neither created nor destroyed, it is always conserved.
* Mass and atoms are always conserved- however, molecules, formula units, moles, and volumes will not necessarily be conserved!
* Before you start, make sure you have a balanced equation.
A mole is the number of carbon atoms in exactly 12 grams of carbon-12.
6.02 x 10^23 is called Avogadro's number.
STANDARD TEMPERATURE AND PRESSURE
Two things affect the volume of a gas temperature and pressure.
Standard temperature and pressure is O degrees Celcius and 1 atm Pressure.
1 mole = 22.4 L of any gas at STP
1 mole = 6.02 x 10^23 representative particles
STOICHIOMETRY
Stoichiometry is greek for measuring elements.
The calculations of quantities in chemical reactions is based on balanced equations.
Balanced equations can be used to determine how much of one substance would be needed or produced from another substance in the equation.
THE SIGNIFICANCE OF A BALANCED EQUATION
When an equation is balanced, the coefficient numbers represent numbers of moles or particles. (atoms, molecules, or formula units.)
As long as the coefficient numbers remain proportional, the equation remains balanced.
IN TERMS OF MOLES
The coefficients tell us how many moles of each substance.
IN TERMS OF MASS
The Law of Conservation of Mass applies- mass is neither created nor destroyed, it is always conserved.
* Mass and atoms are always conserved- however, molecules, formula units, moles, and volumes will not necessarily be conserved!
* Before you start, make sure you have a balanced equation.