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: Given these values of ΔH° : CS2 (l) + 3O2(g) → CO2(g) + 2SO2(g)            Δ H° = -1077 kJ H2 (g) + O2 → H2O2(l)                                    Δ   H° = -188 kJ                 H2 (g) 1/2 O2(g)

Problem

Given these values of ΔH° :

CS2 (l) + 3O2(g) → CO2(g) + 2SO2(g)            Δ H° = -1077 kJ

H2 (g) + O2 → H2O2(l)                                    Δ   H° = -188 kJ                

H2 (g) 1/2 O2(g) → H2O(l)                              Δ   H° =  -286 kJ

What is the value of  ΔH° for this reacion?

CS2(l) + 6H2O2(l) → CO2(g) + 6H2O (l) + 2SO2(g)

a) -1175 kJ•mol-1

b) -1151 kJ•mol-1

c) -1665 kJ•mol-1

d) -3921 kJ•mol-1