Stoichiometry Multistep Conversions. Multistep conversions REVIEW: 24 cookies. How many cups sugar? 24cookies x 1.5c sugar 12 cookies 2 eggs + 1.5 c sugar.

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Presentation transcript:

Stoichiometry Multistep Conversions

Multistep conversions REVIEW: 24 cookies. How many cups sugar? 24cookies x 1.5c sugar 12 cookies 2 eggs c sugar + 2c flour + 1tsp baking + 12 oz Chocolate  12 Cookies soda chips

You only have 42.2 Oz of flour. How many cookies can you make? 42.2 oz flour x 1cup flour x 12 cookies 8oz 2 cups flour = = 31.7 cookies 2 eggs c sugar + 2c flour + 1tsp baking + 12 oz Chocolate  12 Cookies soda chips

You only have 42.2 Oz of flour. How many cookies can you make? 42.2 oz flour x 1cup flour x 12 cookies 8oz 2 cups flour = = 31.7 cookies

In stoich: to use the equation the unit must be in moles. Step 1: Change given amount to moles (if necessary) Step 2: heart step #’s are coefficients. Step 3: Change unknown # of moles to another unit (If necessary) Moles unknown Moles given

Ex: 2P (s) + 3Br (l)  2PBr 3 (s) How many grams of PBr 3 are produced from 1.21 x atoms of phosphorus? 1.21 x atoms 1 X 1mole P 6.02x10 23 atoms X 2 mole PBr 3 2 mole P X g PBr 3 1 mole PBr 3 Step 2 Step 1 Step 3 = g = 0.544g