Ch.6 - Thermochemistry WorksheetSee all chapters
All Chapters
Ch.1 - Intro to General Chemistry
Ch.2 - Atoms & Elements
Ch.3 - Chemical Reactions
BONUS: Lab Techniques and Procedures
BONUS: Mathematical Operations and Functions
Ch.4 - Chemical Quantities & Aqueous Reactions
Ch.5 - Gases
Ch.6 - Thermochemistry
Ch.7 - Quantum Mechanics
Ch.8 - Periodic Properties of the Elements
Ch.9 - Bonding & Molecular Structure
Ch.10 - Molecular Shapes & Valence Bond Theory
Ch.11 - Liquids, Solids & Intermolecular Forces
Ch.12 - Solutions
Ch.13 - Chemical Kinetics
Ch.14 - Chemical Equilibrium
Ch.15 - Acid and Base Equilibrium
Ch.16 - Aqueous Equilibrium
Ch. 17 - Chemical Thermodynamics
Ch.18 - Electrochemistry
Ch.19 - Nuclear Chemistry
Ch.20 - Organic Chemistry
Ch.22 - Chemistry of the Nonmetals
Ch.23 - Transition Metals and Coordination Compounds

Solution: For each of the following reactions, predict the sign of ΔH˚. (i) 2 Mg(s) + O2 (g) ⇌ 2 MgO(s) (ii) 2 KI(s) ⇌ 2 K(g) + I2(g) (iii) Na2(g) ⇌ 2 Na(g) (iv) 2 V2O5(s) ⇌ 4 V(s) + 5O2(g)

Solution: For each of the following reactions, predict the sign of ΔH˚.(i) 2 Mg(s) + O2 (g) ⇌ 2 MgO(s)(ii) 2 KI(s) ⇌ 2 K(g) + I2(g)(iii) Na2(g) ⇌ 2 Na(g)(iv) 2 V2O5(s) ⇌ 4 V(s) + 5O2(g)

Problem

For each of the following reactions, predict the sign of ΔH˚.
(i) 2 Mg(s) + O2 (g) ⇌ 2 MgO(s)
(ii) 2 KI(s) ⇌ 2 K(g) + I2(g)
(iii) Na2(g) ⇌ 2 Na(g)
(iv) 2 V2O5(s) ⇌ 4 V(s) + 5O2(g)