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Unit: Stoichiometry

Day 2 - Notes. Unit: Stoichiometry. Mass-mass calculations using the mole ratio. After today you will be able to…. Calculate the number of grams produced or reacted of a substance given a chemical equation. There are three steps needed for these calculations:

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Unit: Stoichiometry

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  1. Day 2 - Notes Unit: Stoichiometry Mass-mass calculations using the mole ratio

  2. After today you will be able to… • Calculate the number of grams produced or reacted of a substance given a chemical equation

  3. There are three steps needed for these calculations: • Convert gramsmoles (Using the MM of the known.) • Convert moles of knownmoles of unknown using the mole ratio (We learned this yesterday!) • Convertmoles of unknown grams (Using MM of the unknown.)

  4. Mass-Mole-Mole Calculations Example: How many grams of H2O are produced if 2.2 mol of NH3 are combined with excess oxygen? 4 NH3 + 5 O2 6 H2O + 4 NO

  5. Mass-Mole-Mole Calculations 4 NH3 + 5 O2  6 H2O + 4 NO Example: How many grams of O2 are required to produce 0.3 mol of H2O?

  6. There are three steps needed for these calculations:

  7. Mass-Mass Calculations Example: What mass of silver chloride will react with 15.0g of aluminum? __Al 1 __ AgCl 3 __ Ag + __ AlCl3 1 3  + 1Ag =107.871) K: 15.0 gAl 1Cl =35.45(1) U: ? gAgCl 143.32g 1 mol Al 26.98 gAl 143.32 gAgCl 1 mol AgCl 15.0 gAl 1 3 mol AgCl 1 mol Al x x x 239g AgCl =

  8. Mass-Mass Calculations Example: What mass of oxygen gas would be produced from the decomposition of 37.2g of lithium chlorate? __Li(ClO3) 2 __ LiCl + __ O2 3 2  1Li =6.94(1) K: 37.2 gLi(ClO3) 1Cl =35.45(1) 3O =16.00(3) U: ? gO2 90.39g 1 mol Li(ClO3) 90.39 gLi(ClO3) 3 mol O2 2 mol Li(ClO3) 37.2 gLi(ClO3) 1 32.00 gO2 1 mol O2 x x x 19.8 gO2 =

  9. SUMMARY OF IMPORTANT POINTS: • You are calculating the mass for TWO different substances! • Molar mass (MM) is ALWAYS equal to ONE mole! • The ONLY time the number of moles is different than ONE (1) is when you are doing the MOLE RATIO STEP!

  10. Questions? Complete WS 2 for HOMEWORK!

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