Calculate the entropy change in surrounding when 1 mol of `H_2O(l)` is formed under standard condition at 298K. Given`Delta_fH^@` =-286KJ mol^(-1)`

Calculate the depression in freezing point of water when 20g of CH_3CH_2CHClCOOH is added to 500g of water. (Given Ka=1.4xx10^(-3)K_f=1.86 )

calculate the temperature which a solution containing 54g of glucose C_6H_12O_6) in 250g of water will freeze (K_f for water = 1.86 K mol^-1 kg)

Calculate the charge in coulombs required for oxidation of 2 moles of water to oxygen. (Given 1 F = 96500 mol^-1 )

Calculate the depression in the freezing point of water when 10 g of CH_3CH_2CHClCOOH is added to 250 g of water. K_a = 1.4xx10^-3 , K_f = 1.86 K kg mol^-1 .

Calculate the electrode potential at a copper electrode dipped in 0.1 M solution of copper sulphate at 25^@C . Given, the standard emf of Cu^(2+) system is +0.34V at 298K.

Calculate the amount of NaCl which must be added to one kilogram of water so that the freezing point of water is depressed by 3K (Given K_f = 1.86KKg mol^(-1) )

On dissolving 19.5g CH_2F COOH in 500g of water, a depression of 1^@C in freezing point of water is observed. Calculate the vant Hoff factor and dissociation constant of Fluoroacetic acid. (Given, K_f = 1.86 K kg mol^-1)

For the reaction: 2A + B rarr A_2B the rate = k[A][B]^2 with k = 2.0xx10^-6 mol^-2 L^2 s^-1 . Calculate the initial rate of the reaction when [A] = 0.1 mol L^-1 , [b] = 0.2 mol L^-1 . Calculate the rate of reaction after [A] is reduced to 0.06 mol L^-1 .

Calculate the mass of CO_2 in 500 mL of soda water when packed unde 2.5 atm CO_2 pressure at 298K. Given that density of water is 1g mL^-1 and Henry's law constant for CO_2 in water is 1.67xx10^8 Pa at 298K.