Adjusting to reality- Limiting and Excess Reactants

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Adjusting to reality- Limiting and Excess Reactants Stoich Adjusting to reality- Limiting and Excess Reactants

Limiting Reactant Bread Peanut butter Definition: The reactant that limits the amount of product made. Think of the activity we did with the bread and peanut butter Which one was the limiting reactant? (the one we ran out of) Bread Which one was the excess reactant? (the one we had extra of) Peanut butter

Example 1: Sodium chloride can be prepared by the reaction of sodium metal with chlorine gas: 2Na + Cl2  2NaCl Suppose that 6.70 mol Na reacts with 3.20 mol Cl2. What is the limiting reactant? What is the excess reactant? How many moles of NaCl is produced?

Example 2: The equation for the complete combustion of ethene (C2H4) is : C2H4 + 3O2  2CO2 + 2H2O If 2.70 mol C2H4 is reacted with 6.30 mol O2 What is the limiting reactant? What is the excess reactant? Calculate the moles of water produced.

Example 3: 2Cu + S  Cu2S 80.0g of copper reacts with 25.0 g of sulfur. What is the limiting reactant? What is the excess reactant? What is the maximum number of grams of Cu2S that can be formed?

Example 4: 2KBr(aq) + Cl2(aq)  2KCl (aq) + Br2(l) When 0.855 g of Cl2 and 3.205 g of KBr are mixed in solution: A) What is the limiting reactant? B) What is the excess reactant? C) How many grams of Br2 are formed?