Chemical Thermodynamics Question 345

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

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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