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Unit: Stoichiometry

Day 4 - Notes. Unit: Stoichiometry. Limiting reactant calculations. After today you will be able to…. Calculate the limiting reactant using two mass-mass calculations. Limiting Reactant Calculations.

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Unit: Stoichiometry

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  1. Day 4 - Notes Unit: Stoichiometry Limiting reactant calculations

  2. After today you will be able to… • Calculate the limiting reactant using two mass-mass calculations

  3. Limiting Reactant Calculations The limiting reactant (L.R.) is the reactant which runs out first and limits the amount of product that can be made. • Two mass-mass calculations will be used. • The L.R. is the one that yields the smaller amount.

  4. Ok… Time to relate this back to chemistry… A real-world example: Making Funfetti Cupcakes! ___mix + ___eggs + ___oil  ___pan of cupcakes Let’s say you have… 1 3 2 1 Mixes are the “limiting reactant” because they are used up first! 1 pan 3 mixes 3 pans = x 1 mix 1 pan 15 eggs 5 pans = x 3 eggs 1 pan 8 tbsp oil 4 pans = x 2 tbsp oil

  5. Example: If 17.1g of potassium reacts with 14.3g of fluorine, which reactant is the limiting reactant and what mass of potassium fluoride can theoretically be produced? Word equation: potassium + fluorine  potassium fluoride Formula Equation: 2K + F2 2KF 1K=39.10 1F=19.00 17.1gK 14.3gF2 ?gKF K: 17.1gK 58.10g U: ?gKF 1 mol K 39.10g K 17.1g K 1 2 mol KF 2 mol K 58.10gKF 1 mol KF x x x x = 25.4gKF K: 14.3gF2 U: ?gKF 1 mol F2 38.00gF2 14.3gF2 1 2 mol KF 1 mol F2 58.10gKF 1 mol KF x x x = 43.7g KF Potassium is the L.R. 25.4g of potassium fluoride can be produced.

  6. Questions? Complete WS 4 for HOMEWORK!

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