States Of Matter

Question 1

1L= ? m³= ? dm³

Answer 1

1L= 10^-3 m³=1 dm³

Question 2

1 atm= ? Pa= ? torr= ? Bar

Answer 2

1 atm= 10^5 Pa = 760 mm of Hg = 760 torr = 1 bar

Question 3

What is Boyles law ?

Answer 3

For constant moles and temperature

PV= constant

Question 4

What is Charles Law ?

Answer 4

For constant moles and pressure

V/T= constant

Question 5

What is Gas law ( combined one)?

Answer 5

PV/T = constant for constant moles

Question 6

What is Avogadro’s law M=?

Answer 6

M= g x 22.4/ V
; g= given weight of gas
V= volume occupied by gas at stp
M = molecular weight of gas

Question 7

What is Ideal Gas eq in PV=?

PM=?

Answer 7

PV= nRT

PM=dRT

Question 8

What is Dalton’s law of partial pressure p1?

Answer 8

p1= x1 P(t)

Question 9

What is Graham’s law of diffusion / effusion r1/r2=?

Answer 9

r1/r2=
P1/P2
√d2/d1= P1/P2 √M2/M1
; d= density of ga at pressure p

Question 10

What is Root mean square speed ?

Answer 10

C(rms)= √3RT/M

Question 11

What is Average speed of gas molecules c(avg) ?

Answer 11

C(avg)= √8RT/πM

Question 12

What is Most probable speed C(mp)?

Answer 12

C(mp) = √2RT/M

Question 13

What is Average translation kinetic energy of a molecule

Answer 13

KE(avg)= 3/2 RT/N(o)=3/2 KT

; K is Boltzmann constant(1.3x10^-23)

Question 14

What is Real gas eq?

Answer 14

(P+an^/V^)( V-nb)=nRT

Question 15

What is Value of compressibility factor Z in lower pressure region ?

Answer 15

Z= 1 - a/ V(m)RT

Question 16

What is Value of compressibility factor Z in high pressure region ?

Answer 16

Z= 1+ Pb/RT

Question 17

What is Boyle’s temperature T(b)=?

Answer 17

T(b)= a/ Rb

Question 18

What is Critical temperature T(c) of a gas ?

Answer 18

T(c)= 8a/27Rb

Question 19

What is Critical pressure P(c) of a gas ?

Answer 19

P(c)= a/27b^

Question 20

What is Critical Volume V(c) of a gas ?

Answer 20

V(c) = 3b

Question 21

In real gases , what’s a?

Answer 21

a is a measure of force of attraction between gas molecules. n^a/V^ is internal pressure and is pressure correction. Gases which can be easily liquified have a high value of a.

Question 22

What is Unit of pressure correction a for real gas

Answer 22

arm L^ mol^-2

Question 23

Pressure correction a is proportional to what and inversely proportional to what?

Answer 23

a is proportional to B.P of liq and inversely proportional to VP of liquid

Question 24

Under critical state , What is compressibility factor Z=?

Answer 24

Z= 3/8

Question 25

In real gases what is volume correction ?

Answer 25

nb is volume correction due to finite size of molecules.b is called covolume or excluded volume

Question 26

In real gases, what’s the unit of b ?

Answer 26

L mole^-1