Heat & Thermodynamics
What is Kc for the following equilibrium when the equilibrium concentration of each substance is: [SO2]=0.60M,∣O2∣=0.82M and [SO3]=1.90M ?
Each question contains STATEMENT-1 (Assertion) and STATEMENT-2( Reason).
Examine the statements carefully and mark the correct answer according to the instruction given below:
STATEMENT-1: For a reaction at equilibrium, the Gibb's free energy of reaction is minimum at constant temp. and pressure.
STATEMENT-2: The Gibb's free energy of both reactants and products increases and become equal at equilibrium.
Given that Kw for water is 10−13 M2 at 62∘C, compute the sum of pOH and pH for a neutral aqueous solution at 62∘C:
A flask containing 0.5 atm pressure of A2(g,)some solid AB added into flask which undergoes dissociation according to 2AB(s)⇔A2(g)+B2(g),Kp=0.06atm2
The total pressure (in atm) at equilibrium is :
The density of an equilibrium mixture of N2O4 and NO2 at 1 atm and 373.5K is 2.0 g/L.
Calculate KC for the reaction N2O2(g)⇔2NO2(g)
If a system at equilibrium is subjected to a change of any one of the factors such as concentration , pressure or temperature, the system adjusts itself in such a way so as to minimise the effect of that change.
Effect of change in concentration on equilibrium:
As we add or remove reactant (or product) the ratio of equilibrium concentratio become 'Q' (reaction quotient) and depending upon.
Q<K: equilibrium will shift ihn forward direction
Q>K equilibrium will shift in backward direction
Effect of change in pressure :
If a system in equilibrium consists of gases, then the concentrations of all the components can be altered by changing the pressure. When the pressure on the system is increased, then equilibrium will shift in the direction in which there is decrease in number of moles i.e., towards the direction in which there is decrease in volume.
Effect of change in pressure on melting point : There are two rypes of solids :
Solids whose volume decreases on melting, e.g., ice, diamond, carborundum, magnesium nitride and quartz.
Solid (higher volume) ⇔ Liquid (higher volume)
The process of melting is facillitated at high pressure, thus melting point is lowered.
Solid whose volume increase on melting, e.g., Fe, Cu, Ag, Au, etc.
Solid (lower volume) ⇔ Liquid (higher volume)
In this case the process of melring becomes difficult at high pressure, thuse melting point becomes high.
Solubility of substances : When solid substance are dissolved in water, either heat is evolved.
for endothermic solubility process solubility increase with increase in temperature. For exothemic solubility decrease with increase in temperature.
Solubility of gases in liquids : when a gas dissolves in liquid, there is decreases in voolume. Thus increase of pressure will faavour the dissolution of gas in liquid.
Effect of temperature : For endotherimic reacrtion as temperature increases reaction shift in backward direction
For the reaction
If pressure id increased by reducing the volume of the container then :
Consider the pertial decomposition of A as
2A(g)⇔2B(g)+C(g) At equilibrium 700mL gaseous mixture contains 100mL of gas C at 10 atm and 300K what is the value of Kp for the reaction ?
A mixture of 3 moles of SO2, 4 moles of NO2, 1 mole of SO3 and 4 moles of NO is placed in a 2.0L vessel. SO2(g)+NO2(g)⇔SO3(g)+NO(g).
At equilibrium, the vessel is found to contain 1 mole of SO2. Calculate the value of KC.