For the gas phase reaction,

          PCI₅ (g) PCI₃(g) + CI₂(g)

Which of the following conditions are correct ?

The factor of G values is important in metallurgy.  The G values for the following reactions at 800^oC are given as

S₂ (s) + 2O₂(g) → 2SO₂ (g); G = - 544 kJ

2Zn(s) + S₂(s) → 2ZnS(s); G = - 293 kJ

2Zn(s) + O₂(g) → 2ZnO(s); G = - 480 kJ

The G for the reaction

2ZnS(s) + 3O₂(g)  → 2ZnO(s) + 2SO₂ (g) will be

Change in enthalpy for reaction

2H₂O₂(l) → 2H₂O(l) + O₂ (g)

if heat of formation of H₂O₂(l) and H₂O(l) are -188 and -286 kJ/mol respectively is,

One mole of an ideal gas at 300K is expanded isothermally from an initial volume of 1 L to 10 L.  The E for this process is (R = 2 cal mol^-1 K^-1 )

According to the third law of thermodynamics which one of the following quantities for a perfectly crystalline solid is zero at absolute zero ?

In an endothermic reaction, the value of H is

Identify the correct statement for change of Gibb's energy for a system (ΔG_system ) at constant temperature and pressure.

Consider the following reactions

(i)  H⁺ (aq) + OH^- (aq) = H₂O(l)                 -  x₁ kJ mol^-1

(ii)  H₂(g) + O₂ (g) = H₂O (l)                     x₂ kJ mol^-1

(iii)  CO₂ (g) + H₂ (g) = CO (g) + H₂O(l)       -x₃ kJ mol^-1

(iv)  C₂H₂(g) + O(g) = 2CO₂ (g) + H₂O (l)    + x₄ kJ mol^-1

Enthalpy of formation of H₂O(l) is

When 1 mole gas is heated at constant volume, temperature is raised from 298 to 308 K.  Heat supplied to the gas is 500 J.  Then, which statement is correct ?

During isothermal expansion of an ideal gas, its