34) An ultrasonic experiments delivered following data for the speed of sound in

Question

34) An ultrasonic experiments delivered following data for the speed of sound in copper.

cs,1 = 4660 m s-1 (longitudinal)

cs,2 = 2260 m s-1 (transversal)

Calculate the Debye-temperature and the heat capacity expected in the bedye-model for 10 K. You can assume that the density and the speed of sound do not change with changing temperature.

35) A cell Ag(s)|AgBr(s)|KBr(aq)||AgNO3(ag)|Ag(s) at 25°C has an electric motoric force of E= 0.593V. Which reactions happen the both half-cells? Formulate the Nernst-Equation and calculate the activity and the activity coefficient of Br- in the KBr-solution (c =0.1 mol kg-1). The solubility product of AgBr is KL = 4.6 x 10-13 and the activity of the silverions in the AgNO3-solutions is a =0.1.

Explanation / Answer

34) is not a Chemistry question. It should be under Physics.

35) Given cell: Ag(s)|AgBr(s)|KBr(aq)||AgNO3(ag)|Ag(s)
Half cell reactions re as follows:
Anode: Ag+(aq) + Br-(aq) = AgBr(s) + e-
Cathode: Ag+(aq) + e- = Ag

Compelete Cell reaction : Ag+(aq) + Br-(aq) = AgBr(s)
Nernst Equation: Ecell= Ecello + 0.059/n log[ox]/[red]
Ecell = 0.593 and n =1
Thus, Nernst equation for the given cell is-
0.593 = Ecello + 0.059/1 log[Ag+][Br-]/[AgBr]
[AgBr] =1
i.e. 0.593 = Ecello + 0.059 log[Ag+][Br-]

For the rest there is confusion.

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