Units

Question 1

Define the units for:

S= Nm x Am x L

Answer 1

Where Am is area occupied by one adsorbate molecule (m^2),
S is specific surface area (m^2/g),
L is Avogadro’s constant,
Nm (mmol/g)

Question 2

BET equation, define the units

Answer 2

n = uptake (mmol/g)
nm = complete monolayer coverage (mmol/g)
pressures are in pascal

Question 3

D-R analysis equation

Answer 3

D-R analysis = log w equation —>
Where w is micropore volume filled (w can be mass moles or volume), wo is total micropore volume,
po is saturated vapour pressure,
p is pressure

Question 4

Uptake

Answer 4

g/g or mol/g

Uptake (g/g) = uptake (mol/g) x RMM (g/mol)

Question 5

Diffusion coefficient

Answer 5

cm^2/s

Question 6

Activation energy

Answer 6

J/mol

Question 7

Surface tension

Answer 7

N/m

Question 8

Gas constant (R)

Answer 8

J/mol K

Question 9

Surface excess

Answer 9

mol/m^2

Question 10

Surface collision (Z)

Answer 10

m^-2 s^-1

Question 11

Gibbs energy

Answer 11

J/mol

Question 12

Heats of formation (adsorption etc)

Answer 12

J/mol

Question 13

Boltzmann constant,K

Answer 13

1.38x10^-23 J/K

Question 14

m in z equation

Answer 14

Molecular mass, kg/molecule

E.g CO=0.028/6.02x10^23