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25/09/2021 3:49 pm
Topic starter
Following reaction occurs in an automobile 2C8H18(g) + 25O2(g) → 16CO2(g) + 18H2O(g). The sign of ΔH, ΔS and ΔG would be
(a) +, –, +
(b) –, +, –
(c) –, +, +
(d) +, +, –
1 Answer
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25/09/2021 3:53 pm
Correct answer: (b) –, +, –
Explanation:
For combustion reaction, ΔH is negative,
Δn = (16 + 18) - (25 + 2) = +7
so ΔS is +ve, reaction is spontaneous, hence ΔG is –ve.