CHAPTER 7 STOICHIOMETRY

CHAPTER 7 STOICHIOMETRY - CHAPTER 7 STOICHIOMETRY CONTENTS...

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CHAPTER 7 STOICHIOMETRY

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CONTENTS: 7.1 Chemical Equation Balancing 7.2 Reactant and Product Amount: Stoichiometry 7.3 Limitation Reagent 7.4 Theoretical value and Exact Value
OBJECTIVES/ LEARNING OUTCOMES: At the end of this lesson the students should be able to: i) Balance the chemical equation. ii) Calculate the mole, mass, molar mass, moles ratio for given question. iii)Converting mole-mass, mass-mass. iv)Determine limiting reagent.

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What is stoichiometry? Stoichiometry is the quantitative study (calculation) of reactants and products in a chemical reaction.
7.1 CHEMICAL EQUATION BALANCING Exercise 1: Write a balanced chemical equation of the reaction below: 1)H 2 + O 2 ---> H 2 O 2) KClO 3 --- > KCl + O 2

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STEP FOR BALANCING THE EQUATION 1) Write the unbalanced equation . 2) Balance the atoms by placing a coefficient in front of the reactant side or product side . 3) Check . For an equation to be balanced , the number and types of atoms on each side of the equation must be the same. Do the final tally between reactants and products.
7.2 Reactant and Product Amount: Stoichiometry

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Most stoichimetric problems will give you an amount of reactant and ask you to solve for the amount of product formed. Given : Amount of reactants Question: How much of products can be formed. Example 2 A + 2B 3C Given 20.0 grams of A and sufficient B, how many grams of C can be produced?
What do you need? You will need to use i. molar ratios, ii. molar masses, iii. balancing and interpreting equations, and iv. conversions between grams and moles.

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Steps Involved in Solving Mass-Mass Stoichiometry Problems Balance the chemical equation correctly Using the molar mass of the given substance, convert the mass given to moles . Construct a molar proportion (two molar ratios set equal to each other) Using the molar mass of the unknown substance, convert the moles just calculated to mass .
Molar Ratios The ratio

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