Equilibrium constant, Kp

Question 1

the partial pressure of a gas in a mixture of gases is

Answer 1

the pressure that the gas would exert if it alone occupied the volume of the mixture

Question 2

we use parital pressure for …………………reactions involving gases

Answer 2

homogeneous

Question 3

the total pressure of the mixture is equal to

Answer 3

the sum of partial pressures of all the gases present in the mixture

Question 4

the partial pressure of ‘a’ would be

Answer 4

Pa

Question 5

the partial pressure of an individual gas is calculated by

Answer 5

multiplying its mole fraction by the total pressure where
Pa = XaP
where Xa is the mole fraction of gas ‘a’ in the mixture

Question 6

we calculate the mole fraction by

Answer 6

dividing the number of moles of ‘a’ by the total number of moles of gas

mole fraction= mols of ‘a’ / total mols

Question 7

for heterogeneous reaction where there is a solid, we do not

Answer 7

do not include the solid in the Kp expression

Question 8

the expression for Kp =

Answer 8

[PC]c[PD]d
Kp= ——————
[PA]a [PB]b

From the equation:

aA(g) + bB(g) = cC(g) + dD(g)

Question 9

because solids are not taken into account when dealing with gas partial pressures, it means that the pressure of the gas involved is …………………at that given temperature regardless of ………………..

Answer 9

because solids are not taken into account when dealing with gas partial pressures, it means that the pressure of the gas involved is CONSTANT at that given temperature regardless of THE MASS OF SOLID PRESENT

Question 10

for heterogeneous reactions where there is a liquid or aqueous species, we

Answer 10

leave them out of the Kp expression