1. Classwork and a calculator!
Chemistry Week 25
Please get out your
Classwork and a calculator!

2. March 6, 2013 AGENDA: 1 – Agenda/ Bell Ringer 2 – Review HW
Today’s Goal:
Students will be able to convert complete 3-step stoichiometry conversions between grams and grams.
Homework
Gram to Gram Stoichiometry
Friday is the Last Day to make up last week’s quiz.
AGENDA:
1 – Agenda/ Bell Ringer
2 – Review HW
3 – CN: Gram to Gram Stoichiometry
4 – Work Time

3. Wednesday, March 6th Objective:
Students will be able to convert complete 2-step stoichiometry conversions between grams and grams.
Bell Ringer: 2 C4H O2  8 CO H2O
Set-up the units for converting moles of O2 to grams of CO2.
Moles O2 x ________ x _________ = grams CO2

4. March 6, 2013 AGENDA: 1 – Agenda/ Bell Ringer 2 – Review HW
Today’s Goal:
Students will be able to convert complete 3-step stoichiometry conversions between grams and grams.
Homework
Gram to Gram Stoichiometry
Friday is the Last Day to make up last week’s quiz.
AGENDA:
1 – Agenda/ Bell Ringer
2 – Review HW
3 – CN: Gram to Gram Stoichiometry
4 – Work Time

5. Wednesday, March 6th Objective:
Students will be able to convert complete 2-step stoichiometry conversions between grams and grams.
Bell Ringer: 2 C4H O2  8 CO H2O
Set-up the units for converting moles of O2 to grams of CO2.
Moles O2 x moles CO2 x molar mass CO2= gCO2
moles O mol CO2

6. Obj: SWBAT complete 3-step stoichiometry conversions between grams and grams.
Date: 3/6/2013
Balanced Chemical Equation: a A  b B Coefficients = # moles of each compound Grams Moles Moles Grams A A B B
÷ Molar Mass of A
x Molar Mass of B
x b a

7. 2 Mg + 1 O2  2 MgO Grams A  Mole A  Mole B  Gram B
How many grams of MgO would you form from
25 grams of Mg?
Calculate Molar Mass for both compounds in the problem.
1. Molar Mass
Mg = 24.3
O =
40.3 g
1mol
2. Molar Mass
Mg = 24.3
24.3 g
1mol

8. Practice Problem: Gram A  Mole A  Mole B  Gram B
2 Mg O2  2 MgO
Grams A  Mole A  Mole B  Gram B How many grams of MgO would you form from 25 gram of Mg?
1 mol Mg
2 mol MgO
40.3 g MgO
25 g Mg x x x =
2 mol Mg
24.3 g Mg
1 mol MgO
25 x 1 x 2 x g MgO
24.3 x 2 x 1
2015
48.6 = =
41.5 g MgO

9. Set-Up Help Balanced Chem Eq: aA  bB
Calculate the molar masses of both compounds in the problem
Convert: remember Given and Want
Given(g) x1 mol Given x mol Want x Mol.mass Want =
Mol.mass Given mol Given mol Want
Multiply everything in numerator.
Multiply everything in the denominator
Divide Numerator by Denominator.

10. Set-Up Help Balanced Chem Eq: aA  bB Mole A  Mole B  Gram B:
Mole A x b Mole B x Molar Mass B = Gram B
a Mole A mol B
Gram A  Mole A  Mole B
Gram A x 1Mole A x b Mole B = Mole B
Molar Mass A a mol A