THESE NOTES BELONG TO:
NAME ______DATE ______PERIOD 1 2 3 4 5 6 7
LIMITING “REAGENTS”
Bike Shop
in stock: 10 frames 14 wheels
assembly requires __ frame + __wheels 1 bicycle
what limits production? (i.e. what runs out first?)
___ fr ÷ ___ fr/bike = ___ bikes
___ wh ÷ ___ wh/bike = ___ bikes *
· can only make this many (Why?)
Shake Stoichiometry
ex: strawberry banana milkshake
RECIPE for 1 SHAKE:
1 banana + 5 berries+ 2 scoops i.c. + 8oz milk
10 bananas and plenty of the other stuff yields __ shakes
25 strawberries à ___ shakes
8 scoops ice cream requires ___ strawberries
5 bananas, 36 strawberries, 10 scoops i.c. would need how much milk? ______anything leftover? ______
LIMITING REAGENT-CH12
Industry – must use correct proportions
* prevent waste (profit margin)
* purity of product
Example: production of ammonia
N2(g) + 3H2(g) à 2NH3(g)
Equation tells the proportions of N2, H2, and ammonia.
Coefficients are in a 1:3:2 ratio , (like a recipe)
could represent molecules of each or moles of each
Fill in the following:
1N2(g) + 3H2(g) à 2NH3(g)
_____ mole _____moles ______moles
_____ g ______g ______g
_____ L ______L ______L
QUESTIONS: What will happen if 2.0 mol of H2 and
2.0 mol of N2 are mixed and reaction occurs?
a) How much ammonia could be produced from all the H2?
b) How much ammonia could be produced from all the N2?
c) How much ammonia will be produced from this mix?
d) Will anything be left over (unreacted)? What & how much?
e) Which reactant is the “LIMITING REAGENT” (LR) ?
f) Which reactant is in excess (XS)