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Stoichiometry
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Stoichiometry

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    Stoichiometry Stoichiometry Presentation Transcript

    • Stoichiometry
    • You already know... In a balanced equation the coefficients are MOLES. 2H 2 + O 2 -> 2H 2 O 2 moles Hydrogen, 1 mole Oxygen, 2 moles H 2 O How to Calculate Molar Mass: H 2 O = H 2 x 1.01 = 2.02 O 1 x 16.00 = 16.00 18.02 g/mol 1 mole of anything is 22.42 L examples: 1 mole water = 22.42 L 1 mole H 2 SO 4 = 22.42 L 1 mole acetic acid = 22.42 L
    • Before the Math
      • Balance the equation.
        • You need the coefficients.
      • Look at what numbers the question provides.
        • Start with the number given.
      • Look at what the question is asking for.
        • This is where you stop.
        • It is also the correct label.
    • The Math
      • Step 1: Get to the mole.
      • Step 2: Mole to mole ratio from the balanced equation.
      • Step 3: Use the mole to get to what you want.
      • *KEEP LIKE TERMS DIAGONAL.
    • Finding Moles (this is going to be the first step in all the other types of problems)
      • How many moles of oxygen are formed if 1.34 moles of H 2 O 2 completely decomposes?
      • 1) Write and balance:
      • 2H 2 O 2 -> 2H 2 O + O 2 2:2:1
      • 2) Do the math
      = .67 mol O 2 1.34 mol H 2 O 2 (from the problem) 1 mol O 2 (from equation) 2 mol H 2 O 2 (from equation)
    • Finding Liters
      • If I produce 2.4 L of oxygen in the decomposition of H 2 O 2 , how many L of H 2 O 2 did I start with?
      • 1) Write and balance:
      • 2H 2 O 2 -> 2H 2 O + O 2 2:2:1
      • 2) Do the math:
      = 4.8 L H 2 O 2 2.4 L O 2 1 mol O 2 2 mol H 2 O 2 22.42 L H 2 O 2 22.42 L O 2 1 mol O 2 1 mol H 2 O 2
    • Finding Grams
      • In the decomposition of H 2 O 2 , how many grams of H 2 O 2 are required to produce 3.7g of water?
      • 1) Write and balance: 2H 2 O 2 -> 2H 2 O + O 2 2:2:1
      • 2) Because it is grams you need molar masses:
      • O 2 = 32.00 g/mol, H 2 O = 18.02 g/mol, H 2 O 2 = 34.02 g/mol
      • 3)Do the math.
      = 7.02 g H 2 O 2 3.7 g H 2 O 1 mol H 2 O 2 mol H 2 O 2 34.02 g H 2 O 2 18.02 g H 2 O 2 mol H 2 O 1 mol H 2 O 2
    • Grams to Liters? The mole allows for any calculation.
      • In the decomposition of H 2 O 2 , how many L of H 2 O 2 are required to produce 1.5 g of water?
      • 1) Write and balance: 2H 2 O 2 -> 2H 2 O + O 2 2:2:1
      • 2) Do the math:
      = 1.87 L H 2 O 2 1.5 g H 2 O 1 mol H 2 O 2 mol H 2 O 2 22.42 L H 2 O 2 18.02 g H 2 O 2 mol H 2 O 1 mol H 2 O 2