HW Answers10.15 & 16

CatalystIn the following chemical reaction, hydrogen

peroxide is broken down into water and oxygen.

◦__H2O2 → __H2O + __O2

Balance the chemical equation.Is this a decomposition or synthesis

reaction?What is the mole ratio of water to oxygen?What is the mole ratio of hydrogen peroxide

to water?

Objectives and AgendaObjective: I can create mole

ratios from a balanced equation and make mole to mole conversions.

Agenda:◦Catalyst◦Learning target logs◦Mole ratio and conversion practice

Learning Target Logs & PortfoliosWe will be tracking progress

towards standards mastery on learning target logs for Unit 4.

Please put your name on the learning target log.

We will go through how to fill it out together.

AssignmentRead p. 302 – 305; Do practice

problems p. 304 #1 & 2, p. 311 #1, 4(a), 6.

For more practice:◦Pp. 329-330 # 8, 9, 21, 22

p. 304 #1Calculate the amounts requested if 1.34

mol H2O2 completely react according to the following equation.

2H2O2 → 2H2O + O2

a. Moles of Oxygen (O2) formed?

Converting from mol H2O2 to mol O2

1 mol O2___

2 mol H2O2

X1.34 mol H2O2 = 0.67 mol O2

This is the mole ratio from the balanced equation.

This is the amount given in the question.

p. 304 #1Calculate the amounts requested if 1.34

mol H2O2 completely react according to the following equation.

2H2O2 → 2H2O + O2

b. moles of water (H2O) formed?

Converting from mol H2O2 to mol H2O

2 mol H2O 2 mol H2O2

X1.34 mol H2O2 = 1.34 mol H2O

p. 304 #2Calculate the amounts requested if 3.30

mol Fe2O3 completely react according to the following equation.

Fe2O3 + 2 Al→ 2 Fe + Al2O3

a. moles of aluminum (Al) needed? Converting from mol Fe2O3 to mol Al

2 mol Al____ 1 mol Fe2O3

X3.30 mol Fe2O3 = 6.60 mol Al

p. 304 #2Calculate the amounts requested if 3.30

mol Fe2O3 completely react according to the following equation.

Fe2O3 + 2 Al→ 2 Fe + Al2O3

b. moles of iron (Fe) formed? Converting from mol Fe2O3 to mol Fe

2 mol Fe___ 1 mol Fe2O3

X3.30 mol Fe2O3 = 6.60 mol Fe

p. 304 #2Calculate the amounts requested if 3.30

mol Fe2O3 completely react according to the following equation.

Fe2O3 + 2 Al→ 2 Fe + Al2O3

c. moles of aluminum oxide (Al2O3) formed?

Converting from mol Fe2O3 to mol Al2O3

1 mol Al2O3 1 mol Fe2O3

X3.30 mol Fe2O3 = 3.30 mol Al2O3

p. 311 #1, 4(a)1. The mole ratio is the conversion factor

that is present in almost all stoichiometry calculations.

4. (a) How many moles of BrCl form when 2.74 mol Cl2 react with excess Br2?

Br2 + Cl2 → 2BrCl

2 mol BrCl 1 mol Cl2

X2.74 mol Cl2 = 5.48 mol BrCl

p. 311 #6A: In order to solve stoichiometry

problems we have to use moles and not just convert from mass to mass because the balanced chemical equation expresses the ratios of reactants and products according to moles, not grams.