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

10th Edition

ISBN:9781305957404

Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Chapter1: Chemical Foundations

Section: Chapter Questions

Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...

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Concept explainers

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

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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