What are the 3 steps of you use in

STOICHIOMETRY???

HINT: you did this yesterday…

Step 1: Convert given information

to moles…

Step 2: Figure out the coefficient

ratio

Step 3: Convert to what you are

looking for

Don’t forget to balance the

chemical equation and identify the

knowns and unknowns.

http://www.youtube.com/watch?v=ZWSRIIg8KXQ

AND NOW A DISASTER OF CHEMICAL PROPORTIONS!!!

GET READY TO BE A COOKIE CHEMIST

Just don’t do experiments on this guy’s cookie…

Limiting ReactantThe reactant that determines, or LIMITS, the quantity of product that can be formed over the course of a reaction.

The reaction will stop when all of the limiting reactant is consumed.

Limiting Reactant – an extension on stoich

How do we find it?Think about how you completed the cookie investigation

We have to do stoichiometry MORE THAN ONCE and determine which reactant will produce LESS product. That will be the limiting reactant.

Please give me $10 if you are ready to practice!!!

Practice Problems1) Hg + S HgS

48.6g 3.6g ? G

2) C4H10 + O2 CO2 + H2O 215g 75.0g ? g