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: How much heat in kilojoules is evolved or absorbed in each of the following reactions? Burning of 15.5 g of propane: C3H8(g) + 5 O2(g) → 3 CO2(g) + CO2(g) + 4H2O(l) ΔH°= -2220 kJ Reaction of 4.88 g of hydroxide with ammonium chloride. Ba(OH)2 •8H2O(s) + 2NH4Cl(s)→ BaCl2(aq) + 2 NH3(aq) + 10H2O(l) ΔH° = +80.3 kJ

Problem

How much heat in kilojoules is evolved or absorbed in each of the following reactions?

Burning of 15.5 g of propane:

C3H8(g) + 5 O2(g) → 3 CO2(g) + CO2(g) + 4H2O(l) ΔH°= -2220 kJ

Reaction of 4.88 g of hydroxide with ammonium chloride.

Ba(OH)2 •8H2O(s) + 2NH4Cl(s)→ BaCl2(aq) + 2 NH3(aq) + 10H2O(l) ΔH° = +80.3 kJ

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