lecture 2 - gases

Question 1

what do ideal gases assume

Answer 1

0 particle volume
0 interparticle attraction

Question 2

real gas equation

Answer 2

Z = pv/nrt

z is the compression factor

Question 3

what is z

Answer 3

compression factor
=pv/nrt

Question 4

gas with a Z value over 1

Answer 4

hard to compress than ideal gas

Question 5

gas with Z lower than 1

Answer 5

easier to compress than an ideal gas

Question 6

what Z value does air have

Answer 6

0.99999
air is a real gas

Question 7

how can we make up for the untrue ideal gas assumptions

Answer 7

add corrections to pressure and volume

p corr V corr = nRT

Question 8

what does V corr mean

Answer 8

the actual volume of the particles

Vcorr = volume - ( moles x molar volume)

molar volume units m3mol-1

Question 9

what does V corr express

Answer 9

the volume available for compression

Question 10

what does p corr take into account

Answer 10

takes the attractive interaction between particles into account (VDW equations)

pcorr= pressure in absence of interparticle attraction

p corr =pressure + ( an2 / v2)

a = internal pressure

Question 11

what equations use the corrections of p and v

Answer 11

van der waal equations

Question 12

what are the van der waal equations used for

Answer 12

correcting the untrue assumptions of ideal gases

they account for the deviation in ideal gas behaviour

Question 13

do particles in a real gas interact with eachother

Answer 13

yes

Question 14

can an ideal gas be liquefied and why

Answer 14

no
no interparticle interactions

these interactions are needed in liquids

Question 15

can real gases be liquefied

Answer 15

yes - under the right conditions