The `DeltaH_r^@` for the reaction `4S(s)+6O_2(g)rarr 4SO_3(g)` is -1583.2 KJ calculate `Delta H_f^@` of sulphur trioxide.

Delta H- Delta U for the reaction C_3H_8(g) +SO_2 (g) = 3CO_2 (g) + 4H_2O (g) .

for the reaction 2Cl(g)rarr Cl_2(g) What are the signs of Delta H and Delta S ?

Calculate the DeltaG^0 for the reaction N_2(g) + O_2(g) * 2NO(g) Given DeltaH^0 =180.5 K.J , and DeltaS^0 = 15 J at 25^@C .

Discuss the rate of the reaction 2N_(2)O_(5(g)) rarr 4NO_(2(g))+O_(2(g))

Calculate Delta H-DeltaU at 25^@C for the reaction: H_2(g)+( 1/2)O_2(g) = H_2O(l) .

Calculate, the DeltaH at 85^@ for the reaction : Fe_2O_3(s) + 3H_2 to 2Fe (s) + 3H_2O(l) The data are : Delta (298)^@ = -33.29 kJ/mol and

DeltaH^@ & DeltaS^@ for the reaction H_2 (g) + I_2 (g) = 2 HI (g) are 16.23 Kj mol^-1 and 63.8 kj mol^-1 predic whether the reaction be spontaneous at 35^@C .

Calculate DeltaG^(0) for the reaction H_(2)(g)+(1)/(2)O_(2)(g)toH_(2)O(l) at 298K. Given, at 298K DeltaH_(f)^(0) for H_(2)O(l) is -286 kJ *mol^(-1) and the molar entropies (S^(0)) for H_(2)(g),O_(2)(g) and H_(2)O(l) are 130.7, 205.1 and 69.9 J*K^(-1)*mol^(-1) respectively.

At 25^(@)C , Delta H^(0) for the reaction , N_(2)(g)+(1)/(2)O_(2)(g) to N_(2)O(g) , is +82 kJ . At this temperature if the standard molar entropies for N_(2)(g),O_(2)(g) and N_(2)O(g) are 191.6, 205.2 and 219.9 J. K^(-1). " mol"^(-1) respectively, calculate Delta S_("univ")^(0) for the reaction.

Given that H_2O(l) rarr H^+ (aq) + OH^- (aq), DeltaH = 57.32 kJ H_2 (g) + 1/2 O_2(g) rarr H_2O(l) , DeltaH = -286.02 kJ Then calculate the enthalpy of formation of OH^- at 25^@C .