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Enthalpy change of formation at nonstandard conditions

Enthalpy change of formation at nonstandard conditions

Enthalpy change of formation at nonstandard conditions

(OP)
Hello -

I am wondering what deviations can be expected when calculating the heats of formation at pressures in excess of atmospheric.

I am trying to quantify the heat generated by reacting NO with O2 at 45psig & approximately atmospheric temp in a sealed vessel.

I do not believe standard heats of formation is applicable, seeing as how these apply at STP.

Do correlations exist?

Thanks -

Rob

RE: Enthalpy change of formation at nonstandard conditions

Enthalphy is a state function so can't you correct the heats of formation at STP to your conditions to see if it's significant?  

I don't think there's much change in enthalphy from standard pressure to 45 psig, temperature would be more of an issue.

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