Limiting Reagents

Today in class we discussed limiting reagents.  On your blog, describe the process you used to determine how many quarter pound hamburgers could be made.

To determine how many quarter pound hamburgers I could make, I used a recipe (unit converter) and an order list (supplies) to begin.  From there, I found the limiting factor by multiplying the recipe and the order list together.  Some of the ingredients on the recipe required more than one of that ingredient (2 pieces of cheese) to create a quarter pounder.  From the list I created, I looked for the smallest number and concluded that the lowest number was the limiting factor.

For the following reaction, determine which reagent is limiting and how much of the product can be made:

Begin with 8.5 g of hydrogen (H₂) and 40.2 g of oxygen (O₂).

Post you answer and process for solving this question.

	2H2                       +                     O2                       →                   2H2O
Grams	8.5g	40.2g	22.61g
Molar Mass	2.016	32.0	18
Moles	4.216	1.256	1.256
LR	2.11	1.256 x

8.5g of H₂  x          1 mole   _  = 4.216 moles of H₂

       2.016g

40.2g of O₂  x         1 mole   _  = 1.256 moles of O₂

         32.0g

The limiting reactant is Oxygen

1.256 moles of H₂O  x        18g   _ = 22.61g of H₂O

                                     Moles