2. Consider the following chemical reaction: The following thermochemical data i

Question

2. Consider the following chemical reaction: The following thermochemical data is available at 298 K and 1 atm [CO2(g)]--393.5 kJ/mol S"Corp]-213.9 JK''mor1 So[H2(g)] =130.7 JK'"mor! Note that standard conditions refer t changes for this reaction at 298 K under the following nonstandard conditions of reactants (right o all species at 1 atm. Calculate the enthalpy and entropy before they react) and products when the reaction goes to completion: Pco 0.4 atm; Puzo -0.1 atm; Pco,- 0.2 atm; Pus 0.3 atm. Assume that all gases behave ideally.

Explanation / Answer

delH of reaction = (sum of delH of formation of products) - (sum of delH of formation of reactants)

-393.5 - (-241.8 - 110.5) = -41.2 kJ/mol

delS of reaction =(sum of delS of formation of products) - (sum of delS of formation of reactants)

=(213.9+130.7)-(188.8+ 197.7)

= 344.6 - 386.5

=-41.9 J K-1 mol-1

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