Entropy is determined using a table of standard values in much the same way as enthalpies...

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Entropy is determined using a table of standard values in much the same way as enthalpies...

Entropy is determined using a table of standard values in much the same way as enthalpies earlier by using the equation below:

The units of entropy are J/K. The higher the S value, the more disordered the system, so a positive S value is more disordered, and. negative S value is less disordered.

Calculate the entropy change for gasoline in your car engine.

2 C8H18 + 25 O2 -> 16 CO2 + 18 H2O + KJ

C8H18 466

CO2 214

O2 205

H2O 189

science chemistry

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Answer 1

Answer #1

Given:

Sof(C8H18) = 466.0 J/mol.K

Sof(O2) = 205.0 J/mol.K

Sof(CO2) = 214.0 J/mol.K

Sof(H2O) = 189.0 J/mol.K

Balanced chemical equation is:

2 C8H18 + 25 O2 ---> 16 CO2 + 18 H2O

ΔSo rxn = 16*Sof(CO2) + 18*Sof(H2O) - 2*Sof( C8H18) - 25*Sof(O2)

ΔSo rxn = 16*(214.0) + 18*(189.0) - 2*(466.0) - 25*(205.0)

ΔSo rxn = 769 J/K

Answer: 769 J/K

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Answer 2

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Entropy is determined using a table of standard values in much the same way as enthalpies...

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