SiO2(s) + 4 HF(aq) → SiF4(g) + 2 H2O(l)        ∆Horxn = 4.60 kJ ∆Hof, kJ/mol: ???         -320.1      -1.62 x 106   –285.8 a) If the standard enthalpy of reaction for the dissolution of silica in aqueous HF is 4.60 kJ, what is the standard enthalpy of formation of SiO2g) in kilojoules/mole? b) If the Gibbs’ Free energy for this reaction at 25.0oC is -125372.5295 Joules and the standard entropy is 475.93 J/K, above what temperature will this reaction run in the forward direction?

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                    SiO2(s) + 4 HF(aq) → SiF4(g) + 2 H2O(l)        ∆Horxn = 4.60 kJ ∆Hof, kJ/mol: ???         -320.1      -1.62 x 106   –285.8

a) If the standard enthalpy of reaction for the dissolution of silica in aqueous HF is 4.60 kJ, what is the
standard enthalpy of formation of SiO2g) in kilojoules/mole?

b) If the Gibbs’ Free energy for this reaction at 25.0oC is -125372.5295 Joules and the standard entropy
is 475.93 J/K, above what temperature will this reaction run in the forward direction?

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