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10987654321 3/11 Multistep Conversions 1 year = ? min 2. CALCULATE how many minutes are in 1 year by using a “string of conversion” factors. Show all.

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Presentation on theme: "10987654321 3/11 Multistep Conversions 1 year = ? min 2. CALCULATE how many minutes are in 1 year by using a “string of conversion” factors. Show all."— Presentation transcript:

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2 /11 Multistep Conversions 1 year = ? min 2. CALCULATE how many minutes are in 1 year by using a “string of conversion” factors. Show all work. 1. Analyze the cookie recipe. If a baker wanted to make 40 cookies how much of the following would they need: eggs? cups of flour? Make 20 cookies!

3 The Law of Conservation of ________ and a _______________ equation allows us to calculate how much of substance reacts or is produced in a chemical reaction. These types of calculations are called _____________________ and use _______________ factors to solve for an unknown mass or # of moles. Balance the equation below so we can practice some stoichiometry: Introduction to Stoichiometry massbalanced stoichiometry conversion Stoi -chi -om -me -try Stoy-key-ahm-meh-tree

4 The Law of Conservation of ________ and a _______________ equation allows us to calculate how much of substance reacts or is produced in a chemical reaction. These types of calculations are called _____________________ and use _______________ factors to solve for an unknown mass or # of moles. Balance the equation below so we can practice some stoichiometry: H 2 + O 2  H 2 O massbalanced stoichiometry conversion Introduction to Stoichiometry

5 Formation of Water 2H 2 + 1O 2  2H 2 O 

6 Formation of Water 2H 2 + 1O 2  2H 2 O

7 Formation of Water 2H 2 + 1O 2  2H 2 O 2 molecules of H molecules of O 2  2 molecules of H 2 O 2 x H x O 2  2 x H 2 O mole The coefficients are molar ratios! The balanced equation is like a recipe! 2 x H x O 2  2 x H 2 O (6.022 x )

8 mol H 2 How much Oxygen is Required If a chemist has ______ g of H 2, how many g of O 2 would be required for the reaction? GIVEN INFORMATION ____ H 2  ____ H 2 ____ H 2  ____ O 2 ____ O 2  ____ O 2 WHAT I WANT TO KNOW g H 2 gmol g mol H 2 mol O 2 2H 2 + 1O 2  2H 2 O = 79.2 g O 2 g H mol O 2 g O 2

9 SO, WE KNOW THAT FOR ______ g H 2 TO FULLY REACT, ______ g O 2 IS NEEDED. Mass  Mole Conversions g  mol mol  molmol  g

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11 A student sets up the stoichiometry calculation below to find out how much water is made if you start with 200 g of NaOH. 1. WRITE what 3 things they did wrong in their calculation. _2_ NaOH + _1_ H 2 SO 4  _2_ H 2 O + _1_ Na 2 SO g NaOH 1 mol NaOH 200 g NaOH 2 mol NaOH 3 mol H 2 O 1 mol H 2 O g H 2 O = g H 2 O /6 Stoichiometry Error


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