Inorganic Chemistry Answers

how many grams of ammonia will be obtained from 40 g of nitrogen and excess of hydrogen , if the percent yield is 87% ?

When heated at 500 oC in a 5-L reaction vessel, the breaking down of NOCl occurs.
2NOCl (g) ⇌ 2NO(g) + Cl2 (g)

Using Le Chatelier’s Principle, predict and explain how the equilibrium
is affected when
(i) the mixture is transferred to a 2-L reaction vessel
(ii) a catalyst is added
(iii) when more NO gas is added into the reaction vessel
(iv) Cl2 is removed from the vessel as it is formed

Consider the following reaction:
C(s) + H2O(g) ⇌ CO(g) + H2 (g)

If H = 131.4 kJ/mol, predict the direction of shift in equilibrium and the yield
of H2 using Le Chatelier’s Principle if:
(i) Pressures of gases are increased
(ii) Temperature is decreased
(iii) Concentration of C (s) is increased
(iv) Volume of reaction vessel is doubled.
(v) Determine the expression of Kc for this reaction.

6. Consider the hypothetical reaction : A + B -> C
This rapid reaction gives the following data:
Experiment [A-] (M) [B-](M) Initial Rate (M/s)
1 0.1 0.50 0.053
2 0.2 0.30 0.127
3 0.4 0.60 1.02
4 0.2 0.60 0.254
5 0.4 0.30 0.509

(i) Write the rate law for this reaction.
(ii) Calculate the average rate constant with proper units.
(iii) Calculate to the rate when [A] = 0.30M and [B] = 0.40M

4. By assigning oxidation numbers, identify the oxidising agent and the reducing agent
in each of the following reactions.
(a) 2Mg(s) + O2(g) → 2MgO(s)
(b) 2Na(s) + Br2(g) → 2NaBr(s)
(c) Br2 + 2KI → 2KBr + I2
(d) Fe2O3 + C → Fe + CO2
(e) 2NH3 + 3CuO → 3Cu + 3H2O + N2


5. The cell potential, or electromotive force (emf) is important because it is related to
the maximum electrical work that can be obtained from an electrochemical cell. A
voltaic cell is constructed that uses the following reaction and operates at 298K:
Zn(s) + Ni2+(aq) -> Zn2+(aq) + Ni(s)

Given that:
Half reaction Standard Reduction Potential (Ered)
Ni2+(aq) + 2e- --> Ni(s) -0.280 V
Zn2+(aq) + 2e- --> Zn(s) -0.763 V
(a) What is the emf of this cell under standard conditions?

1. From the following heats of reactions that are given:
C(s) + O2 (g) --> CO2 (g) H = -393.5 kJ
2H2 (g) + O2 (g)--> 2H2O (l) H = -571.6 kJ
2C2H2 (g) + 5 O2 (g) --> 4CO2 (g) + 2H2O (l) H = -2598.8 kJ
Calculate the heat of the reaction of the following equation:
2C(s) + H2 (g) --> C2H2 (g)


2. Calculate the Hrxn for the following reaction:
2Al(s) + Fe2O3(s) --> 2Fe (s) + Al2O3(s)
Given that:
I. 2Al2O3 (s) --> 4Al (s) + 3O2(g) H= + 3339.6kJ
II. 4Fe(s) + 3O2(g) --> 2 Fe2O3(s) H= - 1644.4kJ


3. Nitrogen can exists as N2O, NH3, NO and NO2. In which compound is nitrogen in its
lowest oxidation state?

Which of these periods on the periodic table has only eight elements?

SO2 has acidic character. explain.

explain the preparation of sulphuric acid by contact process

explain the preparation of ammonia by harber's process