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Tue 3 Aug, 2010 10:15 pm
A plausible reaction for the production of ethylene glycol is:
2CO(g) + 3H2(g) ----- CH2OHCH2OH(l)
These thermodynamic properties of CH2OHCH2OH(l) at 25⁰C are given: H⁰f = -387.1 kJ/mol CH2OHCH2OH(l), and ∆G⁰f = -298.2 kJ/mol CH2OHCH2OH(l). Use these data, together with other thermodynamic data, to obtain a value of the standard molar entropy of CH2OHCH2OH(l), S⁰, at 25⁰C.
@bjbaltze,
dG is represented by dH- TdS
or to adapt to this
dS = (dG-dH)/T
(-29.8kJ+387.1kJ)/298K
357.3kJ/298Kmol
i don't have a calculator so i can't solve that in my head, but it should be right since dS is represented by J/molK
just remember to convert kiloJouls into jouls by multiplying the answer by 1,000 and that should be it.
right?
55hikky
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