i) lce(s) $⇔$ water(l) $⇔$ water vapour(g) ii) Water $⇔$ water vapour

FE > Semester 1 > Applied Chemistry 1

Marks : 05

Years : DEC 2015

Statement – If the equilibrium of a heterogeneous system is not influenced by gravitational, electrical or magnetic forces or by surface action but only by temperature, pressure and concentration , then the number of degrees of freedom of the system is related to the number of components and phases by the phase rule equation-

$F=C−P+2F \\ F =C−P+2$

For any system at equilibrium at definite temperature and pressure.

i) lce(s) ⇔ water(l) ⇔ water vapour(g)

$C=1, P=3 -(given) \\ F =C−P+2 \\ =1-3+2 \\ F =0$

ii) Water ⇔ water vapour

$C=1, P=2 -(given) \\ F =C−P+2 \\ =1-2+2 \\ F =1$