Physical Chemistry Answers

You added 1 tablespoon of baking soda (14.4g) to 1/4 cup of water (60g). This was too ugh back soda (or not enough water) for all the baking soda to dissolve. One way to get all the baking soda to dissolve would be to add more water. *The solubility of baking soda in water at 20 degrees is very low only 9.6g NaHCO3/100g water. How many grams of water at 20 degrees would you need to be used to completely dissolve the tablespoon (14.4g) of baking soda?

Illustrate the role of chemical kinetics for the deduction of reaction mechanism. What is its role in particular? Does chemical kinetics alone help deduce the reaction mechanism? If not, what are the other necessary criteria? Elaborate with examples.

Calculate the potential of single electrode
a. Zn2+(aq) (0.1M) / Zn. When Eo= -0.76V.
b. Ag+ (0.01M) / Ag (s) E0 = 0.799

2. Calculate the equilibrium constant for the reaction

N¬2O4(g) 2NO2(g)


given that fGo (N2O4(g)) = 97.89 kJ mol-1 and fGo (NO2(g)) = 51.31 kJ mol-1

Calculate the equilibrium constant at 100oC given that fHo (N2O4(g)) = 9.16 kJ mol-1 and fHo (NO2(g)) = 33.18 kJ mol-1.

What mass of HCIO4 must be present in 0.500 L of solution to obtain a solution with a pH=3.5 value

1. Why is starch dust dangerous than coal dust
2. How does smudge pot protect agricultural plant from Frost
3. Aerosol slows down loss of heat by radiation. Explain?

Calculate the standard EMF of a cell which involves the following cell reaction
Zn+ 2Ag+ = Zn^2+ + 2Ag
Given that E0 Zn, Zn^2+ = 0.76 V and E0 Ag, Ag+ = -0.80 V

The EMF of the cell
Cd | CdCl2. 2.1/2 H2O (saturated) AgCl (s) |Ag
is found to be 0.6753 V at 250C and 0.6915 V at 00C. Calculate (G, (H and (S of the cell reaction at 250C.

The EMF of the cell
Cd ( CdCl2. 2.1/2 H2O (saturated) AgCl (s) ( Ag


is found to be 0.6753 V at 250C and 0.6915 V at 00C. Calculate (G, (H and (S of the cell reaction at 250C.

Calculate the enthalpy change at 250C for the reaction occurring in the cell
Zn ( 1.0 M ZnCl2, AgCl (s) ( Ag
The EMF of the cell at 250C is 0.805 V and ((E/(T)p is -3.98X10-4 volt/degree. Faraday = 96500 Columns.