Question

Which reaction, with the following values of AH, AS, at 400 K is spontaneous and endothermic? (1) AH = -48 kJ; AS = + 135 J/K (2) AH = -48 kJ; AS = - 135 J/K (3) AH = +48 kJ; AS = + 135 J/K (4) AH = +48 kJ; AS = - 135 J/K
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Answer 1

Answer:

Thermodynamics

Explanation:

★ ∆G = ∆H - T∆S [ Use this relation ]

» For ENDOTHERMIC [ ∆ H = +ve ]

and for Spontaneous [ ∆G = -ve ]

so ;

∆G = +48Kj - 400 × 135 j / k

= 48kj - 54,000 j

= 48kj - 54kj

∆G = - 6 Kj ( spontaneous )

★ The values only matches option C .

hope it helps u .