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(c) 2 so,(g) O2 (g) 2 SO, (g) carbonate: 19.83 Consider the decomposition of barium Baco, (s) Bao(s) CO2 (g) Using data from Appendix C, calculate the equilibrium pres- sure of CO2 at (a) 298 K and (b) 1100 K. 19.84 Consider the reaction PbCO, (s) a Pbo(s) CO2(g) Using data in Appendix C, calculate the equilibrium pressure of CO2 in the system at (a) 400 oCand (b) 180°C. 19.85 The value of Ka acid (HNO2) at 25 oC is given in Ap- for nitrous pendix D. (a) Write the chemical equation for the equilibrium that corresponds to K By using the value of calculate for the dissociation of nitrous acid in aqueous solution. (c) what is the value of AG at equilibrium? (d) What is the value of AG when [H+] 50 x 10 2 M, NO2 6.0 x 10 4 M, and HNO2] 0.20 M? 19.86 The Kb for methylamine (CH3NH2) at 25 oC is given in Ap- pendix D. (a) Write the chemical equation for the equilib- rium that corresponds to Kb (b) By using the value of Kb, calculate AG for the equilibrium in part (a). (c) What is the value of AG at equilibrium? (d) What is the value of AG when [H+] 6.7 x 10 M, CH,NH, 2.4 x 10 M, and CH NH2] 0.098 M? Co is lowered from 60 oC to 25 oC. (c) Ethyl alcohol evapo- rates from a beaker. (d) A diatomic molecule dissociates into atoms. (e) A piece of charcoal is combusted to form Co2(g) and H2O(g).
