limiting reactant + ? 2b + s ? +
TRANSCRIPT
Limiting Reactant
+ ?
2B + S ?
+
+
2B + S B2S
+
2B + 1S 1B2S
Bread (B) and Salami (S) react in a2 to 1 (2:1) ratio to produce
sandwich (B2S)
+
6B + 2S ?
+
+(leftover)
6B + 2S
+
2B2S
6B + 2S
+
2B2S
The amount of salami limits the amount of sandwichesthat can be produced
what reaction could this be?
2H2 + 1 O2 2H2O
?
what happensif there is an excess amountof hydrogen?
?
?
?
5H2 + 1 O2 2H2O+ 3H2
?
excess H2 + 1 O2 2H2O
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
Calculating Limiting Reactant Do two stoichiometry problems. The one that makes the least product is
the limiting reagent.
If 10.6 g of copper reacts with 3.83 g S. How many grams of product will be formed?
2Cu + S ® Cu2S
10.6 g Cu 63.55g Cu 1 mol Cu
2 mol Cu 1 mol Cu2S
1 mol Cu2S
159.16 g Cu2S
= 13.3 g Cu2S
3.83 g S 32.06g S 1 mol S
1 mol S 1 mol Cu2S
1 mol Cu2S
159.16 g Cu2S
= 19.0 g Cu2S
= 13.3 g Cu2S
Cu is Limiting Reagent
Your turnMg + 2HCl MgCl2 + H2
If 10.1 g of magnesium and 2.87 g of HCl gas are reacted, how many grams of hydrogen gas will be produced?
What is the excess reactant?
Your Turn II 2Al + 3CuSO4 Al2(SO4)3 + 3Cu If 10.3 g of aluminum are reacted with
51.7 g of CuSO4 how much copper will be produced?
What is the excess reagent?