Chemistry Week 25 Please get out your Classwork and a calculator!
Chemistry Week 25
Feb 24, 2016
Chemistry Week 25. Please get out your Classwork and a calculator !. March 5, 2013. AGENDA: 1 – Agenda/ Bell Ringer 2 – CN: Mole to Gram Stoichiometry 3 – Work Time. Today’s Goal: - PowerPoint PPT Presentation
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Chemistry Week
25
Please get out your Classwork and a
calculator!
March 5, 2013AGENDA:1 – Agenda/ Bell Ringer 2– CN: Mole to Gram
Stoichiometry3 – Work Time
Today’s Goal:Students will be able to
convert complete 2-step stoichiometry conversions between grams and moles.
Homework1. Mole to Gram
Stoichiometry2. Friday is the Last Day
to make up last week’s quiz.
Tuesday, March 5th Objective: Students will be able to convert complete
2-step stoichiometry conversions between grams and moles.
Bell Ringer: 2 C4H10 + 13 O2 8 CO2
+ 10 H2OHow many moles of H2O will form if
you react 20 moles of O2?
2 MINUTES REMAINING…
Tuesday, March 5th Objective: Students will be able to convert complete
2-step stoichiometry conversions between grams and moles.
Bell Ringer: 2 C4H10 + 13 O2 8 CO2
+ 10 H2OHow many moles of H2O will form if
you react 20 moles of O2?
1 MINUTES REMAINING…
Tuesday, March 5th Objective: Students will be able to convert complete
2-step stoichiometry conversions between grams and moles.
Bell Ringer: 2 C4H10 + 13 O2 8 CO2
+ 10 H2OHow many moles of H2O will form if
you react 20 moles of O2?
10 seconds Remaining…
BELL-RINGER TIME IS
UP!
March 5, 2013AGENDA:1 – Agenda/ Bell Ringer 2– CN: Mole to Gram
Stoichiometry3 – Work Time
Today’s Goal:Students will be able to
convert complete 2-step stoichiometry conversions between grams and moles.
Homework1. Mole to Gram
Stoichiometry2. Friday is the Last Day
to make up last week’s quiz.
Tuesday, March 5th Objective: Students will be able to convert complete
2-step stoichiometry conversions between grams and moles.
Bell Ringer: 2 C4H10 + 13 O2 8 CO2
+ 10 H2OHow many moles of H2O will form if
you react 20 moles of O2?20 mols O2
x mols H2O mols O2
1013
= 15.4 mols H2O
Balanced Chemical Equation:a A b B
Coefficients = # moles of each compound
Grams Moles Moles Grams
A A B Bx Molar Mass of A
÷ Molar Mass of A
x Molar Mass of B
÷ Molar Mass of B
x b a
x a b
Obj: SWBAT complete 2-step stoichiometry conversions between grams and moles.
Date: 3/5/2013
2 Mg + 1 O2 2 MgO
Mole A Mole B Gram B
How many grams of MgO would you form from 5 mol of Mg?
1. Molar Mass Mg =
24 O = +
16
40 g
1mol
2. Conversions 5 mol Mg x 2 mol MgO x 40 g
MgO 2 mol Mg 1 mol
MgO
= 5 x 2 x 40 g MgO = 400 = 200 g MgO
2 2
Practice Problem: Mole A Mole B Gram B
2 HCl 1 H2 + 1 Cl2 How many gram of H2 will form
from 14 moles of Cl2?
14mol Cl2 xmol Cl2 mol H2
11 x 2.0 grams H2
1 mol H2
= 28 g H2
1
Molar Mass H2 :H = 2 x 1.0 = 2.0 g/mol
= 28 g H2
2 Mg + 1 O2 2 MgO
Gram A Mole A Mole B
How many moles of O2 must be present to react with 100 g of Mg?
1. Molar Mass Mg = 24.3
g
mol
2. Conversions 100 g Mg x 1 mol Mg x 1 mol O2
24 g Mg 2 mol Mg
= 100 x 1 x 1 mol O2 ≈ 2 mol O2 24 x 2
Practice Problem: Gram A Mole A Mole B
2 HCl 1 H2 + 1 Cl2 How many moles of Cl2 will
formfrom 40 grams of HCl?
40 g HCl xg HCl
mol HCl 36.51 x
2 mol HCl= 40 mol Cl2
73
Molar Mass HCl :H = 1 x 1.0 = 1.0
Cl = 1 x 35.5 = 35.5
= 0.55 mol Cl2
HCl = 36.5 g/mol
1 mol Cl2
Set-Up HelpBalanced 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 1 mol B
Gram A Mole A Mole BGram A x 1Mole A x b Mole B = Mole B
Molar Mass A a mol A
Problem Solving Decision Tree
Read the problem
If moles and grams
Calculate Molar Mass
If moles grams
If moles and particles
Multiply by molar mass
If grams moles
Divide by molar mass
If moles particles
Multiply by6.02 x 1023
If particles moles
Divide by6.02 x 1023
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