Short Answer TypeExplain how you can determine the atomic mass of an unknown metal if you know its mass density and the dimensions of a unit cell of its crystal.
Differentiate between molarity and molality values for a solution. What is the effect of change in temperature on molarity and molality values?
The thermal decomposition of HCO2H is a first-order reaction with a rate constant of 2.4 x 10-3 s-1 at a certain temperature. Calculate how long will it take for three-fourths of the initial quantity of HCO2H to decompose.
(log 0.25 = - 0.6021)
What do you understand by the rate law and rate constant of a reaction?
Identify the order of a reaction if the units of its rate constant are:
(i) L-1 mol s-1
(ii) L mol-1 s-1The rate law can be defined as an expression containing the stoichiometric coefficients of reactants and products. It is an expression in which the rate of reaction is given in terms of the molar concentration of the reactants, with each term raised to some power, which may or may not is the stoichiometric coefficient of the reacting species in a balanced chemical equation. The rate constant can be defined as the rate of the reaction when the concentration of each of the reactant is taken as unity.
Example: 2NO(g) + O(g)---> 2NO2(g)
The rate expression for the above reaction can be written as follows:
Rate = k [NO]2 [O2] (Experimentally determined)
Now, if the concentration of NO and O2 is taken to be unity, then the rate constant is found to be equal to the rate of the reaction.
(i) Comparing power of mole in L-1 mol s-1 and (mol L-1)1-n s-1,
We get
1 = l – n => n = 0 i.e., zero order reaction
(ii) Again comparing power of mole in L mol-1 s-1 and (mol L-1)1-n s-1
We get
–1 = 1 – n => n = 2, i.e., second order reaction.Describe the principle controlling each of the following processes:
(i) Preparation of cast iron form pig iron.
(ii) Preparation of pure alumina (Al2O3) from bauxite ore.
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