1. Limiting Reactant 1 frame and 3 wheels are needed to create one tricycle If I have 10 frames and 12 wheels, how many tricycles can I make? 4 I have excess frames. My wheels limit how many tricycles I can make.

2. Limiting reactant is the reactant that is all consumed. Excess reactant is the reactant that is not all consumed.

3. N 2 H 4 + 2H 2 O 2  N 2 + 4H 2 O Which is the limiting reactant when 0.750 moles of N 2 H 4 is mixed with 0.500 mole of H 2 O 2 ? How much water will form if all reactants react? 0.750 mole N 2 H 4 x 4mole H 2 O = 3.0 mole H 2 O 1 mole N 2 H 4 1 mole N 2 H 4 0.500 mole H 2 O 2 x 4 mole H 2 O = 1.00 mole H 2 O 2 mole H 2 O 2 2 mole H 2 O 2 limiting

4. N 2 H 4 + 2H 2 O 2  N 2 + 4H 2 O How much of the excess reactant (in moles) remains unchanged? 0.500 moles H 2 O 2 x 1 mole N 2 H 4 =.250 mole N 2 H 4 2 mole H 2 O 2 2 mole H 2 O 2 0.750 mole -.250 mole =.500 mole N 2 H 4 limitingexcess

5. Summary Determine how much product will form if all of each reactant reacts. The reactant which forms the least amount of product is the limiting reactant. The amount of limiting reactant determines how much product can be formed.