The voltage for the following cell is +0.731 V. Find Kb for the organic base RNH2. Use EscE 0.241V. Pt(s)H2(1.00 atm) |RNH2 (0.100 M), RNH (0.0500 M) || SCE

Complete Question

The complete question is shown on the first uploaded image  

The  value is  

Explanation:

From the question we are told that

   The  voltage of the cell is  

Generally is mathematically represented as  

Where    is the equilibrium constant for this auto-ionization of water with a value  

Generally the is mathematically represented as

=>    

=>      

This   is mathematically represented as

Where n is the number of moles which in this question is  n = 1

         So  

=>      

So  

=>  

=>    

the best answer is d because the strong cohesion is caused by the ability of water molecules to undergo hydrogen bonding.

a is incorrect because when water solidifies, it becomes   ice, which expands and occupies a bigger volume for the same mass of water in its liquid state.

b is incorrect because water has high surface tension. besides bonding to itself it hydrogen bonds to other molecules at the top decreasing possibility for breaking of attractive forces.

c is incorrect because the water molecule has oxygen which is highly electronegative and so pulls the electron pair towards itself creating a dipole moment, making the molecule polar.

e is incorrect because water has strong adhesion, ability to stick to other molecules such as glass because of this molecules having stronger hydrogen bonding than water.