Positive deviation from a Raoult's law:
mixture of ethanol and cyclohexane show positive deviation.
when pure ethanol is added to cyclohexane the moleculeof cyclohexane come in between the molecule of ethanol which result in the breaking of hydrogen bond and thus positive deviation.
Negative deviation from Raoult's law:
Mixture of chloroform and acetone shows negtive deviation when these are mixed hydrogen bond is formed and negtive deviation is shown:
Molality (m) is defined as the number of moles of the solute per kilogram (kg) of the solvent and is expressed as:
Molarity (M) is defined as number of moles of solute dissolved in one litre (or one cubic decimetre) of solution.
(a) Mol. mass of
Volume of solution = 4.3 L
(b) Number of moles present in 1000 ml of 0.5M H2SO4= 0.5 mol
therefore number of moles present in 30ml of 0.5M H2SO4=mol =0.015mol
therefore molarity =0.015/0.5L
thus molarity is 0.03M
Calculate (a) molality (b) molarity and (c) mole fraction of KI if the density of 20% (mass/mass) aqueous KI is 1.202 g mL-1.