Concept explainers
Interpretation:
To determine the
Concept introduction:
The Gibbs free energy or the free energy change is a
The expression for the enthalpy change is:
The expression for the entropy change is:
Answer to Problem 24PS
The value of
The value of
The value of
Explanation of Solution
The
Given:
Refer to Appendix L for the values of standard free energy values.
The given reaction is,
The
The
The
The
The expression for the free energy change is:
Substitute the values,
The
The
The
The
The expression for the enthalpy change is:
Substitute the values,
The
The
The
The
The expression for the entropy change is:
Substitute the values,
The value of
The value of
The value of
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Chapter 21 Solutions
CHEMISTRY+CHEM.REACT. (LL)-W/OWL ACCESS
- Given the following standard free energies at 25°C for the following reactions: N2O5(g)2NO(g)+32O2(g)G=59.2kJNO(g)+12O2(g)NO2(g)G=35.6kJ Calculate G° at 25°C for the following reaction: 2NO2(g)+12O2(g)N2O5(g)arrow_forwardUse the standard free energy of formation data in Appendix G to determine the free energy change for each of the following reactions, which are run under standard state conditions and 25 C. Identify each as either spontaneous or nonspontaneous at these conditions. (a) MnO2(s)Mn(s)+O2(g) (b) H2(g)+Br2(l)2HBr(g) (c) Cu(s)+S(g)CuS(s) (d) 2LiOH(s)+CO2(g)Li2CO3(s)+H2O(g) (e) CH4(g)+O2(g)C(s,graphite)+2H2O(g) (f) CS2(g)+3Cl2(g)CCl4(g)+S2Cl2(g)arrow_forwardData are given in Appendix 1 for white phosphorus, P4(s). P4(g) has the following thermodynamic values: Hf=58.9kJ/mol , S=280.0J/kmol . What is the temperature at which white phosphorus sublimes at 1 atm pressure?arrow_forward
- Using data from Appendix 4, calculate H, G, and K (at 298 K) for the production of ozone from oxygen: 3O2(g)2O3(g) At 30 km above the surface of the earth, the temperature is about 230. K and the partial pressure of oxygen is about 1.0 103 atm. Estimate the partial pressure of ozone in equilibrium with oxygen at 30 km above the earth's surface. Is it reasonable to assume that the equilibrium between oxygen and ozone is maintained under these conditions? Explain.arrow_forwardGiven: P4(s)+5O2(g)P4O10(s)G298=2697.0kJ/mol 2H2(g)+O2(g)2H2O(g)G298=457.18kJ/mol 6H2O(g)+P4O10(s)4H3PO4(l)G298=428.66kJ/mol (a) Determine the standard free energy of formation, Gf, for phosphoric acid. (b) How does your calculated result compare to the value in Appendix G? Explain.arrow_forwardWhat information can be determined from G for a reaction? Does one get the same information from G, the standard free energy change? G allows determination of the equilibrium constant K for a reaction. How? How can one estimate the value of K at temperatures other than 25C for a reaction? How can one estimate the temperature where K = 1 for a reaction? Do all reactions have a specific temperature where K = 1?arrow_forward
- Use data from Appendix J to calculate the enthalpy change and the Gibbs free energy change for the reduction of chromium(III) oxide by aluminum.arrow_forwardUnder standard conditions, what reaction occurs, if any, when each of the following operations is performed? a. Crystals of I2 are added to a solution of NaCl. b. Cl2 gas is bubbled into a solution of NaI. c. A silver wire is placed in a solution of CuCl2 d. An acidic solution of FeSO4 is exposed to air. For the reactions that occur, write a balanced equation and calculate ,G, and K at 25C.arrow_forwardElectrolysis of a solution of CuSO4(aq) to give copper metal is carried out using a current of 0.66 A. How long should electrolysis continue to produce 0.50 g of copper?arrow_forward
- Tungsten is usually produced by the reduction of WO3 with hydrogen: WO3(s)+3H2(g)W(s)+3H2O(g) Consider the following data: WO3(s) H2O(g) Hf(kJ/mol) 839.9 241.8 Gf(kJ/mol) 7631 228.6 a It K 1 or 1 at 25C? Explain your answer. b What is the value of S at 25C? c What is the temperature at which G equals zero for this reaction at 1 atm pressure? d What is the driving force of this reaction?arrow_forwardCalcium metal can be obtained by the direct electrolysis of molten CaCl2, at a voltage of 3.2 V. (a) How many joules of electrical energy are required to obtain 12.0 1b of calcium? (b) What is the cost of the electrical energy obtained in (a) if electrical energy is sold at the rate of nine cents per kilowatt hour?arrow_forward
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