Stoichiometry 4 w/Percent Yield

Refresher on Class GuidelinesRefresher on Class Guidelines

• First off, most people in here do not need to be told this. You’re doing the right thing. It’s noticed and appreciated.

• Things that should not be done during class;

• Loud/disruptive behavior

• Rude behavior towards other students or the teacher

• Swearing/unprofessionalism

• Off-topic conversations / time wasting

• 3 Warnings and you’ll be asked to leave the class.

• You must come after school with your classwork to get credit.

Admit SlipAdmit Slip

Write the action required for each arrow of the diagram.

AgendaAgendaAdmit Slip

Homework Review

Percent Yield and Notes

Classwork

Product: Notes and Classwork

Homework : Problems #1-3

Today’s ObjectivesToday’s Objectives• Students will be able to:

• Convert the mass or moles of one substance to the mass or moles of another substance in a balanced chemical reaction (Stoichiometry)

• Calculate percent yield

Percent Yield 3/29/11

Often in a chemical reaction, you do NOT make as much as you should make according to stoichiometry.

For every percent yield problem, you will calculate how much you SHOULD make of a product (the theoretical amount)

Also, you will be given an amount that is ACTUALLY made of that product.

You compare these two amounts through this equation.

Percent = Actual Amount Yield Theoretical Amount

Percent Yield ExamplePercent Yield Example

• 4 C3H5O + 15 O2 12 CO2 + 10 H2O

• In the lab, you only produce 10 mol of CO2 from 18 mol of O2. What is the percent yield?

• a) How many mol CO2 should you make?

• b) What is the percent yield?

ClassworkClasswork

• Complete problems # 1 – 9 independently or in a small group.

• We will review our work at: