what is the energy interaction between a sodium ion and one water molecule oxygen? assume a charge of -0.8 on the water molecule oxygen and a dielectric constant of 80.

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Bunny GreenfelderLv2

27 Oct 2019

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PROBLEM SET 2: INTERACTION ENERGIES AND PROPERTIES OF SOLUTIONS: Information you will need for these problems: Dielectric constant of H₂O is 80. Dielectric constant of n-pentane is 1.84. Avogadro constant = 6.022 x 10²³ mol^-1.Coulomb constant = 9 x 10⁹ Nm².C². Charge on an electron = 1.602 x 10^-19 C.

1. A chloride ion and a sodium ion are separated by a center-center distance of 0.5 nm. Calculate the interaction energy (the energy required to pull them infinitely apart) if the medium between them is (a) water, or (b) n-pentane. Express the energy in joules per mole of ion pairs.

(c) How far apart would the ions need to be for them to have the same interaction energy as that when they are separated by 0.5 nm in water (i.e. as calculated in part a) if the medium between them is n-pentane? Give your answer in nm.

In order to judge the effect of solvent on the interactionbetween ions in solution, calculate the potential energy in kJ/molof interaction between a sodium ion and a chloride ion, eachtreated as a point charge of + or -e, separated by 9 Angstroms inwater. The dielectric constant of water at room temperature is78.3. Hint: your answer will come out negative because theinteraction is attractive. Also, you'll need to multiply yournumber by Avogadro's number to get it on a per mole basis.

There are 2 water molecules. The oxygen atom of one molecule has a delta minus charge. One of the hydrogen atoms of another water molecule has a delta plus charge. The brackets between these 2 atoms unite charge labels and dots between them, representing that these 2 atoms have an interaction.

The brackets are indicating a(n) _____ bond.

A. Ionic

B. Polar covalent

C. Single (nonpolar) covalent

D. Hydrophobic

E. Hydrogen