Inorganic Chemistry Answers

An aqueous solution of a platinum salt is electrolyzed at a current of 2.498 A

for 3.00 h. As a result, 9.09 g of metallic Pt are formed at the cathode.

Following this half reaction: Ptn+ + ne- → Pt, calculate the charge (represented

by “n+” on the half reaction) on the Pt ions in this solution.

Will the following reaction occur spontaneously at 25°C, given that [Fe2+] = 0.60 M and [Cd2+] = 0.010 M? Cd(s) + Fe2+(aq) → Cd2+(aq) + Fe(s)

 ClO₃ ^- (aq) + I^- (aq)  I₂ (s) + Cl^- (aq)  [acidic]

Consider the oxidation of ammonia: 4NH₃(g) + 3O₂(g) →2N₂(g) + 6H₂O(l). If E° = + 0.06V for N₂ (g) + 6H⁺ + 6e^- → 2NH₃(g). Calculate the ΔG° for the reaction. 

In a certain experiment, with chemical equation Zn(s) + H+ (aq) → Zn2+(aq) + H2(g), the emf (E) of the cell is found to be 0.45 V at 25°C. Suppose that [Zn2+] = .8 M and PH2 = 1.0 atm. Calculate the molar concentration of H+.

For the equilibrium

Br2(g) + Cl2(g) ⇋ 2BrCl(g),

the equilibrium constant Kp is 7.0 at 400 K. If a cylinder is charged with BrCl(g) at an initial pressure

of 1.00 atm and the system is allowed to come to equilibrium, what is the equilibrium partial

pressure of BrCl?

How many grams of water will use to dissolve 250 grams of salt to oroduce 10%brine?

1.   The molecules of gases are governed by four variables such as pressure, temperature, volume and

molar amount which have specific relationships known as the gas laws.

(a)  Chlorine is widely used to treat swimming pool water. The volume of a sample Chlorine gas (CI2) is

6.80 L at 1200 torr and 41 °C.

i.  Calculate how many grams of CI2 are in the sample.

ii.  What is the volume of gas of CI2 at Standard Temperature Pressure (STP) ?

iii.   Calculate at what temperature will the volume be 15.00 L if the pressure is 900 torr.

iv.  Calculate at what pressure will the volume be 7.5 L if the temperature is 88 •C.

Matter exist in different physical forms. The followings questions analyses general characteristics of

matter.

(a) The following table lists the boiling points of compounds of hydrogen. By referring to the type of

intermolecular forces, explain the differences in boiling points between

i. A and B

ii. B and C

iii. C and D

compound formula boiling point/ °C

A methane CH4 -164

B ammonia NH3 -33

C water H2O 100

D silane SiH4 -112

1. explain how the electronegativity of gallium differs from germanium
2. explain how the ionisation energy of gallium differs from germanium
3. explain how the ionisation energy of gallium differs from indium