(i) An ideal solution which obeys Raoult's law over entire range of concentration. The necessary condition to reach ideal solution is:
Enthalpy of mixing of the pure components to form the solution, ∆H‌mix ‌=0 and volume of mixing, ∆V‌mix ‌=0
(ii) Molarity is defined as the number of moles of solute present in 1000‌mL of the solution. Molarity is represented by M.
M=‌

‌ Number of moles of solute ‌

‌ Volume of solution in ‌mL

×1000