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Limiting Reactant. + ? 2B + S ?

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Presentation on theme: "Limiting Reactant. + ? 2B + S ?"— Presentation transcript:

1 Limiting Reactant

2 + ? 2B + S ?

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24 + 2B + S B 2 S

25 + 2B + 1S 1B 2 S Bread (B) and Salami (S) react in a 2 to 1 (2:1) ratio to produce sandwich (B 2 S)‏

26 + 6B + 2S ?

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45 + + (leftover)‏

46 6B + 2S + 2B 2 S

47 6B + 2S + 2B 2 S The amount of salami limits the amount of sandwiches that can be produced

48 what reaction could this be?

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83 2H O 2 2H 2 O

84 ? what happens if there is an excess amount of hydrogen?

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116 ? 5H O 2 2H 2 O+ 3H 2

117 ? excess H O 2 2H 2 O

118 Limiting Reactant  The limiting reactant is the reactant you run out of first.  The excess reactant is the one you have left over.  The limiting reactant determines how much product you can make

119 Calculating Limiting Reactant  Do two stoichiometry problems.  The one that makes the least product is the limiting reagent.  For example  Copper reacts with sulfur to form copper ( I ) sulfide. If 10.6 g of copper reacts with 3.83 g S how much product will be formed?

120  If 10.6 g of copper reacts with 3.83 g S. How many grams of product will be formed?  2Cu + S → Cu 2 S 10.6 g Cu 63.55g Cu 1 mol Cu 2 mol Cu 1 mol Cu 2 S 1 mol Cu 2 S g Cu 2 S = 13.3 g Cu 2 S 3.83 g S 32.06g S 1 mol S 1 S 1 Cu 2 S 1 mol Cu 2 S g Cu 2 S = 19.0 g Cu 2 S = 13.3 g Cu 2 S Cu is Limiting Reagent

121 Your turn Mg + 2HCl → MgCl 2 + H 2  If 10.1 g of magnesium and 2.87 g of HCl gas are reacted  a) what is the limiting reactant?  b) how many grams of hydrogen gas will be produced?

122 Your Turn II 2Al + 3CuSO 4 → Al 2 (SO 4 ) 3 + 3Cu  If 10.3 g of aluminum are reacted with 51.7 g of CuSO 4  a) what is the limiting reactant?  b) how much copper will be produced?


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