Part b)Calculate the standard enthalpy of formation of C2H6 fromits elements using the following data:20 (graphite) + 3H2 (g) → C2H6 (g)C (graphite) + O2 (g)→ CO2 (g)AH;=H, Rol +0, -- H,O ()AH;=2C,H, (g) + 70, (g) → 4CO, (g) + 6H,0 (1)AH3=AH1= -395.9 kJ/molAH2 = -285.8 kJ/mol AH3=-3115.9 kJ/molW

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Calculate the standard enthalpy of formation of C2H6 from its elements using the following data:

Chemistry: Matter and Change

1st Edition

ISBN:9780078746376

Author:Dinah Zike, Laurel Dingrando, Nicholas Hainen, Cheryl Wistrom

Publisher:Dinah Zike, Laurel Dingrando, Nicholas Hainen, Cheryl Wistrom

Chapter15: Energy And Chemical Change

Section: Chapter Questions

Problem 92A

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Concept explainers

Thermochemistry

Thermochemistry can be considered as a branch of thermodynamics that deals with the connections between warmth, work, and various types of energy, formed because of different synthetic and actual cycles. Thermochemistry describes the energy changes that occur as a result of reactions or chemical changes in a substance.

Exergonic Reaction

The term exergonic is derived from the Greek word in which ‘ergon’ means work and exergonic means ‘work outside’. Exergonic reactions releases work energy. Exergonic reactions are different from exothermic reactions, the one that releases only heat energy during the course of the reaction. So, exothermic reaction is one type of exergonic reaction. Exergonic reaction releases work energy in different forms like heat, light or sound. For example, a glow stick releases light making that an exergonic reaction and not an exothermic reaction since no heat is released. Even endothermic reactions at very high temperature are exergonic.

Question

Part b)
Calculate the standard enthalpy of formation of C2H6 from
its elements using the following data:
20 (graphite) + 3H2 (g) → C2H6 (g)
C (graphite) + O2 (g)→ CO2 (g)
AH;=
H, Rol +0, -- H,O ()
AH;=
2C,H, (g) + 70, (g) → 4CO, (g) + 6H,0 (1)
AH3=
AH1= -395.9 kJ/mol
AH2 = -285.8 kJ/mol AH3=-3115.9 kJ/mol
W

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