Physical Chemistry Answers

Consider the reaction of tin and bromine. Sn2+ + Br2 → Sn4+ + 2Br-. The concentration of tin (ii) is 0.050M and the tin (iv) and bromide concentrations is 0.00010M
Q = [ Sn4+][Br-]2 / [Sn2+] and Sn2+ / Sn4+ = +0.150; Br2/Br- = +1.065
Find the voltage of the electrochemical cell using the Nernst equation.

Aqueous chromate ion, CrO4
2-, exists in equilibrium with aqueous dichromate ion, Cr2O7
2- in acidic solution. What effect will (i) increasing the dichromate ion, and (ii) adding HCl
have on the equilibrium?

ider the following reaction:
CO (g) + H2(g)  C(s) + H2O (g) ΔH = -131 kJ mol-1
Explain what would happen to the following equilibrium position and the concentration of H2 if:
i. More C is added?
ii. The concentration of CO is increased?
iii. The concentration of H2O is increased?
iv. The temperature is reduced?

Write the solubility equilibrium expression for Ca(OH)2

By using the Le Chatelier’s principle, discuss the following factors which may affect the
position of equilibrium. In your explanations, mention any possible change in the value of
K, and whether the amounts of reactants or products increases or decreases depending
whether the equilibrium shits either left or right.
i. An increase of the pressure of a gaseous reaction system.
ii. A decrease in the amount of product.
iii. An increase in the amount of reactants.
iv. The volume of the reaction vessel is decreased.

A weak acid HA.having a Ka of 1×10-9 ionises in water according to equation HA<>H+A- .what is the concerntration of all species in a solution of 0.1 mole of HA per cubic centimetre

A water supply sample contain 350mg/L of dissolved solids .Treatment facilities removed 65% . How many litres of water supply containing 5.0% dissolved solids will be produced per 1000L of the water supply sample

Find ∆H in terms of kj for the following reaction
M(g)+2X(g)--->M²+(g)+2X^-(g)
(IE)1 of M(g)=705Kj/mol
(IE)2 of M(g)=1151KJ/mol
(EA)1 of X(g)= -328KJ/mol
Answer 1200KJ

30m^3 of moist air at a total presssure of 101.325 kPa and 303K contains water vapour in such a proportion that its partial pressure is 2.933 kPa
Keeping the total pressure constant, temperature is reduced to 288K, during which process, some water vapour condenses out. After cooling, partial pressure of water is found to be 1.693kPa. Calculate the volume of air at 288K and weight of water condensed.

A constant current was passed through a solution of AuCl4
-
ions between gold electrodes. After a period of 10.00 minutes the cathode increased in weight by 1.314grams.
How much charge was passed and what was the current ?