For the conversion of 1 mole of `SO_2(g)` to `SO_3(g)` the heat of reaction at constant volume (`Delta U^@`) at 298K is -97.027 KJ Calculate the enthalpy change (`Delta H^@`)

One mole of naphthalene ( C_10H_8 ) is burnt in oxygen at constant volume to give CO_2 and water at 25^@C The heat evolved is found to be -5138.8 KJ mol^(-1) Calculate the heat of reaction at constant pressure.

The standard enthalpy of formation of ammonia is -42.19 kJ. Calculate the heat of the following reaction at constant volume. N_2(g) + 3H_2(g) rarr 2NH_3(g)

For the reaction H_2(g)rarr2H(g) predict the signs of DeltaH and DeltaS .

For a reaction: 2NH_3(g) overset(Pt)rarrN_2(g) + 3H_2(g) Rate = K, Write the unit of k.

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.

Calculate the standard cell potential of the Galvanic cell in which the following reaction takes place: Fe^(2+)(aq) + Ag^+(aq) rarr Fe^(3+)(aq) + Ag(s) . Calculate the Delta_rG and equilibrium constant of the reactions.

Calculate the standard cell potential of the Galvanic cell in which the following reaction takes place: 2Cr(s) + 3Cd^(2+)(aq) rarr 2Cr^(3+)(aq) + 3Cd(s) . Also calculate the Delta_rG and equilibrium constant of the reaction.

A hockey ball of mass 200 g travelling at 10 m s^-1 is struck by a hockey stick so as to return it along its original path with a velocity at 5m s^1 . Calculate the change of momentum occured in the motion of hockey ball by the force applied by the hockey stick.

2000 cm^3 of an aqueous solution of a protein contains 1.26 g of the protein. The osmotic pressure of such a solution at 300K is found to be 2.57 … 10^(-3) bar. Calculate the molar mass of the protein.

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)