Chemical Reactions - Temperature and Gibbs Free Energy

1- If ΔH = -60.0kJ and ΔS = -0.200kJ/K , the reaction is spontaneous below a certain temperature. Calculate that temperature. Express your answer numerically in kelvins.

2-The chemical reaction that causes aluminum to corrode in air is given by
4Al+3O 2 →2Al 2 O 3 in which ΔH rxn ∘ = −3352 kJ and ΔS rxn ∘ = −625.1 J/K)

Part A: What is the standard Gibbs free energy for this reaction? Assume the commonly used standard reference temperature of 298 K. Express your answer as an integer and include the appropriate units.

Part B : What is the Gibbs free energy for this reaction at 5975K ? Assume that ΔH and ΔS do not change with temperature.Express your answer to two decimal places and include the appropriate units.

Part C: At what temperature, T , do the forward and reverse corrosion reactions occur in equilibrium? Express your answer as an integer and include the appropriate units.

Solution Summary

This solution contains detailed step-wise calculation of some numerical problems related to thermodynamics.

... Where ΔG^0 =(m μ _M^0 + nμ _N^0) - (aμ _A^0 + bμ _B^0 ), and is defined as the standard free energy of reaction at temperature T and ...Chemical potential ...

... 1. For a constant temperature process what is the relationship ... V and p? 2. Using the equation you have ... Using 3 and 3the definition of chemical potential above ...

... an equilibrium expression for any chemical equation, multiply the ... Delta G for a reaction under non-standard ... under standard conditions, the temperature, and the ...

... and the stoichiometric coefficients from the balanced chemical reaction: ... that at higher temperatures, the reaction will be ... and at lower temperatures, it will ...

... following equation G=H-TS where H is the enthalpy, T is the temperature and S ... It also discusses Gibbs free energy and how it relates to chemical reactions. ...

... Applied to a chemical system this means that the entropy ... to predict the spontaneity of a reaction at constant ... heat change (Q) divided by the temperature(T) of ...

...Chemicals inside CO(NH2)2 Solid Mass 3.000g. ... a starting temperature of 21.00C Chemical inside: CO ... the saturated solution, calculate ?S using the equation for Gibb...

... describe a process that is only spontaneous at low temperatures? ... acid (HI) Part B: Write an equation showing how ... Express your answer as a chemical equation. ...

... The combination of low temperature and the presence ... cell uses current to drive a chemical reaction. ... difference in concentration between the two half-reactions. ...