Question

Consider the following spontaneous reaction
2C₈H₁₈ (g) + 25O₂ (g) → 16CO₂ (g) +18H₂O(g)
The sign of ∆H, ∆S, ∆G would be respectively
(a) +, –, + (b) –, + , – [Kerala PMT 2013]
(c) +, +, – (d) –, –, –

Answer 1

answer : option (b) –, + , –

for spontaneous reaction, 2C₈H₁₈ (g) + 25O₂ (g) → 16CO₂ (g) +18H₂O(g)

∆S > 0 and ∆G < 0

as given reaction is exothermic [ we know, combustion of Alkane releases enormous amount of heat. so given reaction is exothermic reaction] and hence, ∆H must be negative.

so, ∆H < 0, ∆S > 0 and ∆G < 0

then, –, + , – option (b) is correct choice.

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Answer 2

Answer:

option b

Explanation:

-., +, -

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