Calculate the entropy change in surroundings when 1.00 mol of \( H_2O\)(l) is formed under standard conditions. \( Δ_f H^ Θ= –286 kJ mol^{–1}.\)

Comment on the thermodynamic stability of NO(g), given,

(\( \dfrac{1}{2}\))N_2(g) + (\( \dfrac{1}{2}\))O_2(g) → NO_(g); \( \Delta _{r}H^{\Theta } = 90kJmol^{-1}\)

NO_(g) + (\( \dfrac{1}{2}\))O_2(g) → NO_2(g); \( \Delta _{r}H^{\Theta } = -74kJmol^{-1}\)

The equilibrium constant for a reaction is 10. What will be the value of ∆G₀? R = 8.314 JK^–1 mol^–1, T = 300 K.

For the reaction

2A_(g) + B_(g)→ 2D_(g)

\( \Delta U^{\Theta } = -10.5 kJ \;and \;\Delta S^{\Theta } = -44.1JK^{-1}\)

Calculate \( \Delta G^{\Theta }\) for the reaction, and predict whether the reaction may occur spontaneously.

For the reaction

2Cl_(g)→ Cl_2(g)

What are the signs of \( \Delta S\; and \;\Delta H\)?