Limiting Reagents or Limiting Reactants. Simulation Sam works at the Salem Sandwich Shoppe. Sam expected a big day on Tuesday, so he ordered the following:

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Presentation transcript:

Limiting Reagents or Limiting Reactants

Simulation Sam works at the Salem Sandwich Shoppe. Sam expected a big day on Tuesday, so he ordered the following: 5 pounds of bologna (10 slices per pound) 4 pounds of cheese (16 slices per pound) 5 packages of buns (12 buns per package) How many sandwiches can Sam make?

How Many? First, let’s look at how Sam will assemble each sandwich: 1 slice bologna + 1 slice cheese on 1 bun

Limiting Reagent Which of the ingredients will run out first? Sam has: –50 slices of bologna –64 slices of cheese –60 buns

CORRECT You got it right, the bologna is going to run out first because there are only 50 slices. Therefore we can deduce that Sam can only make 50 sandwiches. Sam will have excess cheese and buns.

Simulation Conclusion Even though Sam started with 5 pounds of bologna and only 4 pounds of cheese; he ran out of bologna first. Why?

Guided practice 1 How many grams of product can you produce if you react 26.28g of strontium with 39.95g of bromine. Process Write a balanced equation. Perform DA twice to solve for mass of product in each case Lowest amount made = actual product possible Limiting reactant is the one that produces the least product

Typical Limiting reactants question How many grams of product can you produce if you react 26.28g of strontium with 39.95g of bromine.

Sr + Br 2  SrBr 2 1 mole Br g Br g Br 2 1 mole Br 2 1 mole SrBr g SrBr 2 1 mole Sr 26.28g Sr 87.6g Sr 1 mole Sr 1 mole SrBr g SrBr g SrBr g SrBr 2

Br 2 is the limiting reagent! The Br 2 will run out first because there are less moles of Br 2 than Sr. Now calculate the mass of product using the number of moles of the limiting reagent.

CFU 1 mole Br g Br g Br 2 1 mole Br 2 1 mole SrBr g SrBr g SrBr 2 Where do these values come from?

CFU 1 mole Br g Br g Br 2 1 mole Br 2 1 mole SrBr g SrBr g SrBr 2 What does this box do and what is special about it?

CFU 1 mole Br g Br g Br 2 1 mole Br 2 1 mole SrBr g SrBr g SrBr 2 How was this value determined?

We do How many grams of sodium chloride will be produced if 0.93g of sodium oxide reacts with 1.67g of barium chloride? AP

Na 2 O + BaCl 2  2 NaCl + BaO 1 mole Na 2 O 0.93g Na 2 O 62g Na 2 O 1 mole Na 2 O 2 mole NaCl 1 mole NaCl 58.5 g NaCl 1 mole BaCl g BaCl BaCl 2 1 mole BaCl 2 2 mole NaCl 1 mole NaCl 58.5 g NaCl g NaCl g NaCl