Question

Considering the Formation reaction for Silica (reaction 3)... Find the enthalpy of formation for SiO2 at...

Considering the Formation reaction for Silica (reaction 3)...

Find the enthalpy of formation for SiO2 at STP (in symbols and in numbers) reaction (3).

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Find the entropy of formation for SiO2 at STP (in symbols and in numbers) reaction (3).

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Find the free energy of formation for SiO2 at STP (in symbols and in numbers) reaction (3).

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Find the equilibrium constant for reaction (3) at STP (in symbols and in numbers).

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Find the enthalpy of formation for SiO2 at 500 K,1 atm (in symbols and in numbers) reaction (3).

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On reverse side, find the equilibrium constant for reaction (3) at 500K (in symbols & in numbers).

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Answer #1

Considering the Formation reaction for Silica

Si (s) + O2 (g) -----------------> SiO2 (s)

enthalpy of formation for SiO2 at STP

ΔHforxn = ΔHoproducts - ΔHoreactants

            = ΔHoSiO2 - (ΔHoSi + ΔHoO2)

= - 910.94 - (0 + 0)

= - 910.94 kJ/mol

ΔHfo = - 910.94 kJ/mol

entropy of formation for SiO2 at STP

ΔSforxn = ΔSoSiO2 - (ΔSoSi + ΔSoO2)

= 41.84 - (18.83 + 205.03)

   = -182.02 J/K

ΔSfo = - 182.02 J/K

free energy of formation for SiO2 at STP

ΔGof = ΔHf - T x ΔSf

= - 910.94 - 298 x -182.02 x 10^-3

= - 856.67 kJ/mol

ΔGof = - 856.67 kJ/mol

equilibrium constant for reaction (3) at STP

ΔGo = - RT ln K

- 856.67 = - 8.314 x 10^-3 x 298 x ln K

K = 1.46 x 10^150

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