Ch 4 Aqueous Reactions Chemical quantities

Ch 4 Aqueous Reactions Chemical quantities - Chapter 4...

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Chapter 4 hemical Quantities and Aqueous Reactions Chemical Quantities and Aqueous Reactions Dr. Marilyn R. Mackiewicz
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Key Learning Concepts eaction Stoichiometry o Reaction Stoichiometry o Limiting reactant o Theoretical yield o Percent yield o Solution Concentration and Stoichiometry o Types of solutions and solubility rules o Precipitation reactions o Solution concentration o Molarity o Aqueous Solutions and Interactions o Molecular nic o Ionic o Complete ionic equations o Acid-base and Gas-Evolution Reactions o Redox Chemistry
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The Greenhouse Effect o CO 2 is one of the primary greenhouse gas that many scientists are concerned about The Greenhouse Gas “Dispute” CO 2 is not the cause! Hey man! Volcanoes produce more CO 2 o What does more coal usage mean? Coal CO 2 2 C 8 H 18 ( l ) + 25 O 2 ( g ) 16 CO 2 ( g ) + 18 H 2 O( g ) Coal is a mixture of compounds
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Reaction Stoichiometry e numerical relationships between chemical amounts in a reaction is o the numerical relationships between chemical amounts in a reaction is called stoichiometry e coefficients in a balanced chemical equation specify the relative o the coefficients in a balanced chemical equation specify the relative amounts in moles of each of the substances involved in the reaction molecules of C act with 25 molecules of O 2 C 8 H 18 ( l ) + 25 O 2 ( g ) 16 CO 2 ( g ) + 18 H 2 O( g ) 2 molecules of C 8 H 18 react with 25 molecules of O 2 to form 16 molecules of CO 2 and 18 molecules of H 2 O 2 moles of C 8 H 18 react with 25 moles of O 2 to form 16 moles of CO 2 and 18 moles of H 2 O 2 mol C 8 H 18 : 25 mol O 2 : 16 mol CO 2 : 18 mol H 2 O Stoichiometric Ratio
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Predicting Amounts from Stoichiometry e amounts of any other substance in a chemical reaction can be o the amounts of any other substance in a chemical reaction can be determined from the amount of just one substance ow much CO n be made from 22 0 moles of C the o How much CO 2 can be made from 22.0 moles of C 8 H 18 in the combustion of C 8 H 18 ? C + 25 O 6 CO + 18 H ( Mole to Mole Conversions 2 C 8 H 18 ( l ) + 25 O 2 ( g ) 16 CO 2 ( g ) + 18 H 2 O( g ) 2 moles C 8 H 18 : 16 moles CO 2 2 2 18 8 CO moles 176 ol CO mol 16 H C moles 22.0 18 8 H C mol 2
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Example – Estimate the mass of CO produced in 2004 by the Mass to Mass Conversions 2 combustion of 3.4 x 10 15 g gasoline o assuming that gasoline is octane, C 8 H 18 , the equation for the reaction is: 2C 8 H 18 ( l )+25O 2 ( g ) 16 CO 2 ( g )+18H 2 O( g ) o the equation for the reaction gives the mole relationship between amount of C 8 H 18 and CO 2 , but we need to know the mass relationship, so the Concept Plan will be:
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Example – Estimate the mass of CO 2 produced in 2004 by the combustion of 3.4 x 10 15 g gasoline 3.4 x 10 15 g C 8 H 18 g CO 2 Given: Find: Concept Plan: mol 1 2 CO mol 6 1 g C 8 H 18 mol CO 2 g CO 2 mol C 8 H 18 g 44.01 1 mol C 8 H 18 = 114.22g, 1 mol CO 2 = 44.01g, 2 mol C 8 H 18 = 16 mol CO 2 Relationships: g 114.22 18 8 H C mol 2 mol 1 Solution: 2 2 18 8 2 18 8 18 8 18 8 15 CO mol 1 CO g 44.01 H C mol 2 CO mol 16 H C g 114.22 H C mol 1 H C g 10 .4 3 since 8x moles of CO as C H 8 , but the molar mass of C H 8 is 3x Check: 2 16
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This note was uploaded on 07/17/2010 for the course CHEM 221 taught by Professor Semor during the Summer '08 term at Portland State.

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Ch 4 Aqueous Reactions Chemical quantities - Chapter 4...

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