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Skeletal Reactions for Combustion

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State all assumptions (e.g. ideal gas etc).

Given the followin skeletal reaction for the combustion of hydrogen to generate water using the tables attached to the test: 2H??2(g) + O2(g) ----> 2H2O(g)

(a) Determine the Î"HO, Î"So, and Î"Go for the above reaction at 298 Kelvin at 1 bar pressure.

(b) Justify and compare how a change (rise and drop) in temperature will affect how spontaneous the reaction will become. Also, at what temperature will the Î"S of the universe equal zero for this reaction?

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Solution Preview

Given the following skeletal reaction for the combustion of hydrogen to generate water and using tables of standard thermodynamic data:

2H2(g) + O2(g) ----> 2H2O(g)

(a) Determine the Ho, So, and Go for the above reaction at 298 Kelvin at 1 bar pressure.

(b) Justify and compare how a change (rise and drop) in temperature will affect how spontaneous the reaction will become. Also, at what temperature will the S of the universe equal zero for this reaction?
The relevant thermodynamic data, rounded to the nearest 10, are:

Quantity (Units) H2(g) O2(g) H2O(g)
fHO (kJ mol-1) 0 0 -240
SOm (J mol-1 K-1) 130 210 190
fGO (kJ mol-1) 0 0 -230

The standard enthalpy, entropy, and free energy changes of the reaction are calculated using the values from the table and the stoichiometric coefficients from the balanced chemical reaction:

where arxn is the stoichiometric coefficient for a given ...

Solution Summary

The expert examines skeletal reaction for combustion.

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