5.42. For the reaction 2Na (g) = Na₂ (g) the following values of K have been determined (C. T. Ewing et al., J. Chem. Phys. 1967, 71, 473): T(K) 900 1000 1100 1200 K 1.32 0.47 0.21 0.10 From these data, estimate AxnHº for the reaction. (Hint: using the function of linear regression to solve the problem)

the following thermesdyna mic and partial prassuce data, detormine the Gibbs Energy (AG) for the reaction : Give 2 PeO cg) Clz cq> 2 2 Pe OCI (9) at 298 k in kJ /mol substance AG (KJ/ncol ) P (bar) Pe O cg> - 220.4 0.40 ch (q? Information is missing 0.17 PeOckgs 420.4 0.59

Calculate the change in S when one mole of water is heated from 263 to 283 K given the molar capacities inJ.K-1 , Cp(ice) = 2.09 + 0.126T, Cp(water)=75.3, and change in Hm=6000Jmol-1

10mL of an aqueous solution containing 0.020 M RCOOH (pKa = 6.00) is mixed with 10mL of CCI4. The partition coefficient is 3.0. When the pH of the aqueous phase is adjusted to 6.00, 0.012 M of RCOOH is measured in the CCL4 phase. What will be the formal concentration of RCOOH in the aqueous solution if its pH was adjusted to 7.00 before extraction?