Question

9. Write true or false a) Partial molar volume is defined as y = b) The volume of a solution at T and p is equal to the sum of the volumes of its pure components c) The partial molar volume of a components i in a solution must equal the molar volume of the d) The SI units for partial molar volume are m/mol. ni p,T,njsi at T and p pure component i If part of a solution is wasted the partial molar volumes in the remaining solution are equal to the original minus the lost part. e) f) The volume of a solution cannot be less than the volume of the pure solvent used to prepare the solution g) The chemical potential of a component in a solution is a partial molar quantity. h) Partial molar volumes of components of a mixture vary with concentration i) Partial molar volumes are always positive but molar volumes need not be. j Te Gibbs-Duhem equation applies only to binary mixtures [10]

please kindly help with true or false from a to j. thank you

Answer 1

a) True, as the partial molar volume is the change in the volume of system when infinitesimally small amount of "i",'j' or 'k' is added or subtracted from the system at constant temperature and pressure. We cannot measure the change in volume by varying temperature and pressure as that would give us false results and results due to change in composition (by adding subtracting i, j or k) will be masked otherwise. Therefore this formula is correct.

b) True , Volume is extensive property and it will be the sum of all components of system.

c) False , let us suppose we have components i and j comprise 100 ml of whole system. The molar volume for i will be V_i / n_total

whereas partial molar volume is Change in volume with no. of moles of j plus change with moles of i .

d) True, its unit is equivalent to m³/mol.