Assuming a domestic refrigerator a reversible engine working between melting point of ice and the room temperature of `17^@C`.Calculate the enrgy in joule that m ust be suppled to freeze 2kg of water .Given that temperature of water`= 0^@C ` nd `L=80 cal//g`.

45g of ethylene glycol (C_2H_6O_2) is mixed with 600 g of water. Calculate: the freezing point of the solution. (K_f for water=1.86K kg mol^-1) .

19.5 g of CH_2FCOOH is dissolved in 500 g of water. The depression in the freezing point of water observed is 1.0° C. Calculate the van’t Hoff factor and dissociation constant of fluoroacetic acid.

Surface tension is exhibited by liquids due to force of attraction between molecules of the liquid. The surface tension decreases with increase in temperature and vanishes at boiling point. Given that the latent heat of vaporation for water rho_(w) = 540kcal/kg ,mechanical equivalent heat =4.2j/cal Avogadro's No. N_A = 6.0 xx 10^26 , and the molecular weight of water M_A = 18 kg for 1 k mole. Estimate the energy required for oe molecule of water to evaporate.

100 g of water is supercooled to -10^@C . At this point, due to some disturbance mechanised or otherwise some of its suddenly freeazes to ice What will be the temperature of the resultant mixture and how much mass would freeze? (S_W = 1 cal//g//^@C and L_(W fusion) = 80 cal/g].

Determine the value of Delta H and Delta U for the reversible isothermal evaporation of 90.0 g of water at 100^(@)C . Assume that water behaves a an ideal gas and beat of evaporation of wager is 540 cal/g (R = 2.0 cal mol^(-1) K^(-1))

What concentration of nitrogen should be present in a glass of water at room temperature? Assume a temperature of 25^@C , a total pressure of 1 atmosphere and mole fraction of nitrogen in air of 0.78. (K_H for nitrogen=8.42xx10^-17 M/(mm Hg))

A coper block of mass 2.5 kg is heated in a furnace to a temperature of 500 ^@C and then placed on a large ice block. What is the maximum amount of ice that can melt? (specific heat of copper = 0.39 J g^-1 C^-1 , heat of fusion of watter = 335 J g^-1 ).

Calculate the boiling point of solution when 2 g of Na_2SO_4 (M=142gmol^-1) was dissolved in 50 g of water, assuming Na_2SO_4 undergoes complete ionization. (K_b for water=0.52 K kg mol^-1) .