P6B.10 Fuel cells show promise as power sources for automobiles. Hydrogen and carbon monoxide have been investigated for use in fuel cells, so their solubilities, s, in molten salts are of interest. Their solubilities in a molten NaNO,/KNO, mixture were found to fit the following expressions: 768 log(s,/molcm³bar")=-5.39-K 980 log(sco/molcm³bar)=-5.98-K Calculate the standard molar enthalpies of solution of the two gases at 570 K.

Consider the following equilibrium: AGCI(s) 2 Ag*(aq) + Cl(aq) Ksp = 1.77x1010 %3D What is the standard Gibbs energy change at 25°C? O -22.1 kJ 55.6 kJ O 1.55 kJ O 139 kJ

Consider a reaction with a large negative Gibbs energy change, as shown below: 42.6 kJ mol-1 Y Z , AG°/ = The reaction is initiated by adding 16 mmol of compound Y into the flask, in the absence of compound Z is present. After 48 hours, analysis reveals the presence of 4 mmol of Z and 12 mmol of Y. Which is the most likely explanation? ▪▪▪▪▪▪ - OY and Z have reached equilibrium concentrations. An enzyme has shifted the equilibrium toward Y. Formation of Z is kinetically slow; equilibrium has not been reached by 48 hours. Formation of Z is thermodynamically unfavorable. Two of the above explanations are reasonable.

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