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: The reaction of cyanamide, NH2CN(s), with oxygen was run in a bomb calorimeter, and ΔE was found to be -742.7 kJ/mol of NH2CN(s) at 298 K. Calculate ΔH for the reaction at this temperature. Reaction:

Problem

The reaction of cyanamide, NH2CN(s), with oxygen was run in a bomb calorimeter, and ΔE was found to be -742.7 kJ/mol of NH2CN(s) at 298 K. Calculate ΔH for the reaction at this temperature. 

Reaction: NH2CN (s) + 3/2O2 (g) → N2 (g) + CO2 (g) + H2O (l) 

a. -727.8 kJ/mol 

b. -737.7 kJ 

c. -741.5 kJ 

d. -742.7 kJ 

e. none of the above