Consider these reactions, where M represents a generic metal. 1. 2 M(s) + 6 HCI(aq) 2. НСI(9) — 2 MCl, (aq) + 3 H,(g) AH = -848.0 kJ HCI(aq) AH, = -74.8 kJ 3. H, (g) + Cl, (g) 4. MCI, (s) → MCI, (aq) → 2 HCI(g) AH3 = -1845.0 kJ %3D AH4 =-355.0 kJ Use the information to determine the enthalpy of the reaction. 2 M(s) + 3 Cl, (g) → 2 MCl, (s) AH =? STRATEGY 1. Identify how each equation should be manipulated. 2. Calculate the new individual enthalpies. 3. Calculate the overall enthalpy by adding the individual enthalpies. Step 1: Equations 1-4 can be summed to get the overall reaction, but there are some manipulations that have to occur first, such as reversing an equation, or multiplying it by a factor. Identify how each equation should be used by filling out the table. Equation Direction Factor Answer Bank 1 2. forward 6. 3 reverse 1 3 4
Consider these reactions, where M represents a generic metal. 1. 2 M(s) + 6 HCI(aq) 2. НСI(9) — 2 MCl, (aq) + 3 H,(g) AH = -848.0 kJ HCI(aq) AH, = -74.8 kJ 3. H, (g) + Cl, (g) 4. MCI, (s) → MCI, (aq) → 2 HCI(g) AH3 = -1845.0 kJ %3D AH4 =-355.0 kJ Use the information to determine the enthalpy of the reaction. 2 M(s) + 3 Cl, (g) → 2 MCl, (s) AH =? STRATEGY 1. Identify how each equation should be manipulated. 2. Calculate the new individual enthalpies. 3. Calculate the overall enthalpy by adding the individual enthalpies. Step 1: Equations 1-4 can be summed to get the overall reaction, but there are some manipulations that have to occur first, such as reversing an equation, or multiplying it by a factor. Identify how each equation should be used by filling out the table. Equation Direction Factor Answer Bank 1 2. forward 6. 3 reverse 1 3 4
Chemistry & Chemical Reactivity
10th Edition
ISBN:9781337399074
Author:John C. Kotz, Paul M. Treichel, John Townsend, David Treichel
Publisher:John C. Kotz, Paul M. Treichel, John Townsend, David Treichel
Chapter5: Principles Of Chemical Reactivity: Energy And Chemical Reactions
Section: Chapter Questions
Problem 96IL: Insoluble PbBr2(s) precipitates when solutions of Pb(NO3)2(aq) and NaBr(aq) are mixed. Pb(NO3)2(aq)...
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Thermochemistry
Thermochemistry can be considered as a branch of thermodynamics that deals with the connections between warmth, work, and various types of energy, formed because of different synthetic and actual cycles. Thermochemistry describes the energy changes that occur as a result of reactions or chemical changes in a substance.
Exergonic Reaction
The term exergonic is derived from the Greek word in which ‘ergon’ means work and exergonic means ‘work outside’. Exergonic reactions releases work energy. Exergonic reactions are different from exothermic reactions, the one that releases only heat energy during the course of the reaction. So, exothermic reaction is one type of exergonic reaction. Exergonic reaction releases work energy in different forms like heat, light or sound. For example, a glow stick releases light making that an exergonic reaction and not an exothermic reaction since no heat is released. Even endothermic reactions at very high temperature are exergonic.
Question
Transcribed Image Text:Consider these reactions, where M represents a generic metal.
1. 2 M(s) + 6 HCI(aq)
2 MCl, (aq) + 3 H,(®)
AH = -848.0 kJ
2. НСI(9) —
HCl(aq)
AH, = -74.8 kJ
3. H, (g) + CL, (g)
→ 2 HCI(g)
AH3 = -1845.0 kJ
%3D
4. MCl, (s) MCI, (aq)
AH4 =-355.0 kJ
Use the information to determine the enthalpy of the reaction.
2 M(s) + 3 Cl, (g) → 2 MCl, (s)
AH =?
STRATEGY
1. Identify how each equation should be manipulated.
2. Calculate the new individual enthalpies.
3. Calculate the overall enthalpy by adding the individual enthalpies.
Step 1:
Equations 1-4 can be summed to get the overall reaction, but there are some manipulations that have to occur first, such as
reversing an equation, or multiplying it by a factor. Identify how each equation should be used by filling out the table.
Equation
Direction
Factor
Answer Bank
1
2.
forward
6.
3.
reverse
1
3
4
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