Although `DeltaS` for the formation of two moles of water from `H_2` and `O_2` is = -327 JK-1 it is spontaneous.Explain `(Given Delta H for the reaction is -572KJ)`

(Delta H - Delta U) for the formation of carbon monoxide (CO) from its elements at 298K is (R = 8.314 K^(-1)mol^(-1))

Explain the formation of H_2 molecule on the basis of valence bond theory.

If the standard molar enthalpy of formation of CaO_((s)), CO_(2(g)) "and" CaCO_(3(s)) is -635, -393 "and" -1207 kJ mol^-1 respectively, the Delta_r H^@ in kJ mol^-1 for the reaction CaCO_(3(s)) to CaO_((s)) + CO_(2(g)) is ________ .

The heat change Delta H for the reaction 2 CO +O_2to 2 CO_2, Delta H=-135 kcal is called ______ .

For the reaction, C_2H_4(g) + H_2(g)rarr C_2H_6(g), K_p= 3.356 xx 10^(17) Calculate Delta G° for the reaction at 25^@C .

The enthalpy change for the formation of 3.6 kg water is _____ . H_(2(g))+1/2 O_(2(g)) to H_2 O_((l)), Delta H=-284.5 kJ mol^-1

Write thermochemical equation for complete oxidation of one mole of H_2(g) . Standard enthalpy change of the reaction is -286 kJ. Is the value -286 kJ, enthalpy of formation or enthalpy of combustion or both? Explain.

Conversion of oxygen to ozone represented by the equation 3 O_2 to 2 O_3 is an endothermic reaction. Enthalpy change Delta H accompanying the reaction _________ .

Although both CO_2 and H_2O are triatomic molecules, the shape of H_2O molecules is bent while that of CO_2 is linear. Explain this on the basis of dipole moment.

For a certain reaction DeltaH = - 25 kJ and DeltaS = - 40 JK^(-1) . At what temperature will it change from spontaneous to non-spontaneous reaction?