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chapter4.part2.forBB.2008

# chapter4.part2.forBB.2008 - The Mole and Chemical Reactions...

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1 The Mole and Chemical Reactions What mass of O 2 and Br 2 is produced by the reaction of 25.0 g of TiO 2 with excess BrF 3 ? Notes: Check the equation is balanced! • Stoichiometric ratios: 3TiO 2 3O 2 ; 3TiO 2 2Br 2 ; and many others Excess BrF 3 = enough BrF 3 to react all the TiO 2 . 3 TiO 2 (s) + 4 BrF 3 ( l ) 3 TiF 4 (s) + 2 Br 2 ( l ) + 3 O 2 (g) 2 = 25.0 g x = 0.3130 mol TiO 2 1 mol 79.88 g n TiO2 = mass TiO 2 / FM TiO 2 What mass of O 2 and Br 2 is produced by the reaction of 25.0g of TiO 2 with excess BrF 3 ? 3 TiO 2 (s) + 4 BrF 3 ( l ) 3 TiF 4 (s) + 2 Br 2 ( l ) + 3 O 2 (g) 3 mol TiO 2 3 mol O 2 0.3130 mol TiO 2 = 0.3130 mol O 2 3 mol O 2 3 mol TiO 2 The Mole and Chemical Reactions

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3 Mass of O 2 produced = n O2 (mol. wt. O 2 ) = 0.3130 mol x 32.00 g/mol = 10.0 g 3 TiO 2 2 Br 2 n Br2 = 0.3130 mol TiO 2 = 0.2087 mol Br 2 2Br 2 3 TiO 2 Mass of Br 2 = 0.2087 mol = 33.4 g Br 2 159.81 g mol Br 2 What mass of O 2 and Br 2 is produced by the reaction of 25.0g of TiO 2 with excess BrF 3 ? 3 TiO 2 (s) + 4 BrF 3 ( l ) 3 TiF 4 (s) + 2 Br 2 ( l ) + 3 O 2 (g) The Mole and Chemical Reactions 4 Reactions with Reactant in Limited Supply Given 10 slices of cheese and 14 slices of bread. How many sandwiches can you make? Balanced equation 1 cheese + 2 bread 1 sandwich 1 cheese 2 bread 1 cheese 1 sandwich 2 bread 1 sandwich
5 Two methods can be used. Both treat as a unit conversion problem Product Method Product Method – Calculate the product from each starting material. The reactant giving the smallest smallest number is limiting. 10 cheese x = 10 sandwiches 1 sandwich 1 cheese 14 bread x = 7 sandwiches 1 sandwich 2 bread Correct answer Bread is limiting. It will be used up first Reactions with Limited Reactants 6 Reactant Method Reactant Method Pick a reactant; calculate the amount of the other(s) needed. Enough?

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chapter4.part2.forBB.2008 - The Mole and Chemical Reactions...

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