Question

Derive the mathematical expression between molar mass of a

nonvolatile solute and elevation of boiling point.

State Henry’s law? How does solubility of a gas in water varies with?

temperature.​

Answer 1

Answer:

We know the formula of molality as,

molality, m=

mass of solvent in kg

moles of solute

molality, m=

W

1

/1000

W

2

/M

2

=

M

2

W

1

1000W

2

--- 1

where W

2

= weight of solute

M

2

= molar mass of solute

W

1

= weight of solvent

Also, we have relation, ΔT

b

=i×k

b

×m ---- 2

From Eqn. 1 and 2 we get

ΔT

b

=

M

2

×W

1

i×k

b

×1000×W

2

So, M

2

=

ΔT

b

×W

1

i×k

b

×1000×W

2

Vant Hoff-Avogadro’s law:

Vant Hoff Avogadro's law states that an equal volume of all gases, at the same temperature and pressure, have the same number of molecules.

Mathematically it is expressed as,

V∝n

volume ∝ no. of molecules/amount of substance(moles).

"or"

n

1

V

1

=

n

2

V

2

: From gas law.

V

1

n

2

=V

2

n

1

.