Thermodynamics Question 102

Question: Following reaction occurring in an automobile 2C8H18(g)+25O2(g)16CO2(g)+18H2O(g). The sign of ΔH,ΔS and ΔG would be

[CBSE PMT 1994; KCET 1999]

Options:

A) +, -, +

B) -, +, -

C) -, +, +

D) +, +, -

Show Answer

Answer:

Correct Answer: B

Solution:

For Combustion reaction, ΔH is negative, Δn=(16+18)(25+2)=+7 , so ΔS is +ve , reaction is spontaneous, hence ΔG is -ve.



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