Calculate the value of Avogardo Constant from the following data. `Density of NaCl = 2.165 gcm^-3`, `distance `bet^n Na^+ and Cl^- in NaCl = 281 pm` `(molar mass of NaCl = 58.5 gmol^-1)`

The density of NaCl crystal is 2.165 gmcm^-3 and the distance between Consecutive cation and anion is 281 pm. Calculate the value of Avogadro's numbers.

Calculate the boiling point of a solution prepared by adding 15.00g of NaCl to 250g water. (K_b for water = 0.512 K kg mol^-1, molar mass of NaCl, 58.44g mol mol^-1 .

What mass of NaCl (molar mass= 58.5g mol^-1) must be dissolved in 65g of water to lower the freezing point by 7.5^@C ? The freezing point depression constant, K_f for water is 1.86 K kg mol^-1 . Assume vant Hoff factor for NaCl is 1.87.

Two elements A and B form compounds having formula AB_2 and AB_4 . When dissolved in 20 g of benzene (C_6H_6) , 1 g of AB_2 lowers the freezing point by 2.3 K whereas 1.0 g of AB_4 lowers it by 1.3 K. The molar depression constant for benzene is 5.1 K kg mol^-1 . Calculate atomic masses of A and B.

The molar conductances of NaCl, HCl and CH_3COONa at infinite dilution are 126.45, 426.16 and 91.0 Scm^2 mol^-1 , respectively at 25^@C , Calculate the moalr conductance of acetic acid at infinite dilution.