The standard enthalpies of formation of Al₂O₃ and CaO are $$-$$1675 kJ mol^-1 and $$-$$635 kJ mol^$$-$$1 respectively.

For the reaction

3CaO + 2Al $$ \to $$ 3Ca + Al₂O₃ the standard reaction enthalpy $$\Delta$$_rH⁰ = _________ kJ.

(Round off to the Nearest Integer)

At 25$$^\circ$$C, 50 g of iron reacts with HCl to form FeCl₂. The evolved hydrogen gas expands against a constant pressure of 1 bar. The work done by the gas during this expansion is _________ J. (Round off to the Nearest Integer).

[Given : R = 8.314 J mol^$$-$$1 K^$$-$$1. Assume, hydrogen is an ideal gas] [Atomic mass of Fe is 55.85 u]

The average S-F bond energy in kJ mol^$$-$$1 of SF₆ is _____________. (Rounded off to the nearest integer)

[Given : The values of standard enthalpy of formation of SF₆(g), S(g) and F(g) are - 1100, 275 and 80 kJ mol^$$-$$1 respectively.]

For a chemical reaction A + B ⇌ C + D

($${\Delta _r}{H^\Theta }$$ = 80 kJ mol^$$-$$1) the entropy change $${\Delta _r}{S^\Theta }$$ depends on the temperature T (in K) as $${\Delta _r}{S^\Theta }$$ = 2T (J K^$$-$$1mol^$$-$$1).

Minimum temperature at which it will become spontaneous is ___________ K. (Integer)