a$)$ Explain the principle of continuity of states by showing phase regions.

b$)$ Since the surface area of ethyl alcohol is $22\mathrm{.}3\backslash$times $10^-7$ N$/$m and its density is $0\mathrm{.}79$g$/$cm$^2,$ the ethyl alcohol rises $1\mathrm{.}81$ cm in the capillary tube with a radius of $0\mathrm{.}318$ cm$.$ Calculate the ethyl alcohol contact angle

$.$c$)$ HCL dipole moment was measured as $1\mathrm{.}03$ D$.$ Since the Hcl bond length is r: $1276$ oA$,$ calculate and explain the percentage and how much ionic character it has.