Unit+4-Stoichiometric+calculations

  ~ Stoichiometry is the mathematical study of the relationships between the amounts of reactants used and the amount of products formed by a chemical reaction. ~ However, before you can attempt a Stoichiometric calculation, you need to know how to balance an equation. ~ For an equation to be balanced, the number of each element in the reaction must be the same on both sides. For example: 2Mg + O2 > 2MgO

__**Mole Ratio**__

Given the equation:

C3H8 + 5O2 -> 3CO2 + 4H2O

~ The mole ratio is derived from the balanced equation; therefore, the ratio of propane to oxygen is:

__1 mol propane (C3H8)__ 5 mol oxygen (O2)

~ The formula used for general stoichiometric calculations is:

__moles of unknown__ x moles of known **=** moles of unknown moles of known