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: Use the standard reaction enthalpies given below to determine ΔH°rxn for the following reaction: P4(g) + 10Cl2(g) → 4PCl5(s)                ΔH°rxn = ? Given PCl5(s) → PCl3(g) + Cl2(g)              

Problem

Use the standard reaction enthalpies given below to determine ΔH°rxn for the following reaction:

P4(g) + 10Cl2(g) → 4PCl5(s)                ΔH°rxn = ?

Given

PCl5(s) → PCl3(g) + Cl2(g)                   ΔH°rxn = +157kJ
P4(g) + 6Cl2(g) → 4PCl3(g)                  ΔH°rxn = -1207kJ

A) -1835 kJ

B) - 1364 kJ

C) -1050 kJ

D) -1786kJ

E) -2100 kJ