21. Which ion-dipole interaction below results in the smallest (less negative) h

Question

21. Which ion-dipole interaction below results in the smallest (less negative) hydration energy? 12 pts) water Na' water K' water Provide a brief explanation for your answer. 12 pts] 22. Indicate the main type of intermolecular force (ion-dipole, dipole-dipole, hydrogen bonding. dispersion) that must be overcome in order to: [4 x 2 pts] (0) melt solid ice (u) evaporate liquid benzene (CeHe) (ii) evaporate water from salt water (iv) sublime solid iodine 23. The unit cell of rhenium oxide is shown below. How many rhenium atoms are present in the unit cell? Show your calculations in the space provided. [4 pts] Okygen

Explanation / Answer

21. option (3) is the right answer . for K+ hydration enthalpy is less negative.

hydration enthalpy is change in enthalpy during attraction between negative charge of oxygen in water and the positive charge of metal. so, it can be concluded that hydration enthalpy depends on charge (directly) of the metal and size (inversly proportional) of the metal. As all are group 1 metals, so charge is constant. But down the group size increase and the hydraton enthalpy decreases.

22. (i) hydrogen bonding

(ii) dispersion

(iii)ion-dipole

(iv) dipole-dipole

23. number of metal is 8

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