There are two isomeric hydrocarbons with formula C,H10, butane and isobutane, which we denote here B and I. The standard enthalpies of formation for the gaseous species are -124.7 kJ mol¬1 for B, -131.3 kJ mol-1 for I; the standard free energies of formation are -15.9 kJ mol¬1 for B, -18.0 kJ mol¬1 for I. (a) Which is the more stable under standard conditions, and which has the higher entropy? (b) The reaction B 2 Ican occur in the presence of a catalyst. Calculate the equilibrium constant at 298 K for the conversion of B to I, and calculate the per- centage of B in the equilibrium mixture.
There are two isomeric hydrocarbons with formula C,H10, butane and isobutane, which we denote here B and I. The standard enthalpies of formation for the gaseous species are -124.7 kJ mol¬1 for B, -131.3 kJ mol-1 for I; the standard free energies of formation are -15.9 kJ mol¬1 for B, -18.0 kJ mol¬1 for I. (a) Which is the more stable under standard conditions, and which has the higher entropy? (b) The reaction B 2 Ican occur in the presence of a catalyst. Calculate the equilibrium constant at 298 K for the conversion of B to I, and calculate the per- centage of B in the equilibrium mixture.
Principles of Modern Chemistry
8th Edition
ISBN:9781305079113
Author:David W. Oxtoby, H. Pat Gillis, Laurie J. Butler
Publisher:David W. Oxtoby, H. Pat Gillis, Laurie J. Butler
Chapter13: Spontaneous Processes And Thermodynamic Equilibrium
Section: Chapter Questions
Problem 21P
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Transcribed Image Text:There are two isomeric hydrocarbons with formula C,H10,
butane and isobutane, which we denote here B and I. The
standard enthalpies of formation for the gaseous species
are -124.7 kJ mol¬1 for B, -131.3 kJ mol-1 for I; the
standard free energies of formation are -15.9 kJ mol¬1
for B, -18.0 kJ mol¬1 for I.
(a) Which is the more stable under standard conditions,
and which has the higher entropy?
(b) The reaction B 2 Ican occur in the presence of a
catalyst. Calculate the equilibrium constant at 298 K
for the conversion of B to I, and calculate the per-
centage of B in the equilibrium mixture.
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