17.0 g of NH₃ completely vapourises at $$-$$33.42$$^\circ$$C and 1 bar pressure and the enthalpy change in the process is 23.4 kJ mol^$$-$$1. The enthalpy change for the vapourisation of 85 g of NH₃ under the same conditions is _________ kJ.

1.2 mL of acetic acid is dissolved in water to make 2.0 L of solution. The depression in freezing point observed for this strength of acid is 0.0198$$^\circ$$C. The percentage of dissociation of the acid is ___________. (Nearest integer)

[Given : Density of acetic acid is 1.02 g mL^$$-$$1, Molar mass of acetic acid is 60 g mol^$$-$$1, K_f(H₂O) = 1.85 K kg mol^$$-$$1]

A dilute solution of sulphuric acid is electrolysed using a current of 0.10 A for 2 hours to produce hydrogen and oxygen gas. The total volume of gases produced a STP is _____________ cm³. (Nearest integer)

[Given : Faraday constant F = 96500 C mol^$$-$$1 at STP, molar volume of an ideal gas is 22.7 L mol^$$-$$1]

The activation energy of one of the reactions in a biochemical process is 532611 J mol^$$-$$1. When the temperature falls from 310 K to 300 K, the change in rate constant observed is k₃₀₀ = x $$\times$$ 10^$$-$$3 k₃₁₀. The value of x is ____________.

[Given : $$\ln 10 = 2.3$$, R = 8.3 J K^$$-$$1 mol^$$-$$1]