Stoichiometry II. REMEMBER ALL stoichiometry problems start with a ALL stoichiometry problems start with a balanced equation.

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Presentation transcript:

Stoichiometry II

REMEMBER ALL stoichiometry problems start with a ALL stoichiometry problems start with a balanced equation

How to do Mass-Mass Problems 1. Balance the equation 2. Convert the mass into moles (divide by molar mass) 3. Multiply the correct mole ratio 4. Convert the moles into mass (multiply by molar mass)

Example How many grams of iron will react with 8.8 grams of oxygen? How many grams of iron will react with 8.8 grams of oxygen? Fe + O 2 FeO Fe + O 2 FeO

Mole-Mass Problems You may be given the moles of one substance and be asked to find the mass in grams of another substance. You may be given the moles of one substance and be asked to find the mass in grams of another substance.

Mole-Mass Problems 1. Balance the equation 2. Multiply the moles given by the correct mole ratio 2. Multiply the moles given by the correct mole ratio 3.Convert the moles into mass (multiply by molar mass) 3.Convert the moles into mass (multiply by molar mass)

Example How many grams of FeO will be produced from 20.8 moles of oxygen? How many grams of FeO will be produced from 20.8 moles of oxygen? Fe + O 2 FeO Fe + O 2 FeO

Mass-Mole If you are given a mass, in grams, of one substance and asked to find the number of moles of another substance. If you are given a mass, in grams, of one substance and asked to find the number of moles of another substance.

Mass-Mole 1. Balance the equation 1. Balance the equation 2. Convert the mass given into moles (divide by molar mass) 2. Convert the mass given into moles (divide by molar mass) 3. Multiply by the correct mole ratio 3. Multiply by the correct mole ratio

Example How many moles of FeO will be produced if 50 grams of Fe is reacted with excess oxygen? How many moles of FeO will be produced if 50 grams of Fe is reacted with excess oxygen? Fe + O 2 FeO Fe + O 2 FeO