Which is correct for the combustion reaction occurring in an automobile is 2C8H18(.s.) + 25O2(.g.) arrow 16(CO)2(.g.) + 18H2O(.g.) .

Question

Which is correct for the combustion reaction occurring in an automobile is 2C8H18(.s.) + 25O2(.g.) arrow 16(CO)2(.g.) + 18H2O(.g.) . (A) Δ H=-ve;Δ S+ve;Δ G=+ve (B) Δ H=+ve;Δ S-ve;Δ G=+ve (C) Δ H=-ve;Δ S+ve;Δ G=-ve (D) Δ H=+ve;Δ S+ve;Δ G=-ve

Tardigrade Admin · Accepted Answer

By applying the Helmholtz equation: it shows the relationship between Change in enthalpy

Δ H

, change in entropy

Δ S &

change in free energy

Δ G

Δ G = Δ H - T Δ S

Δ S = + Ve

(Since moles of gases in the product are greater than that of the reactant) and

Δ H =

- V e

(Since, it is a combustion reaction)

Δ G = - V e

(Since temperature cannot be negative)

Q. Which is correct for the combustion reaction occurring in an automobile is $2 C_{8} H_{18} (s) + 25 O_{2} (g) \to 16 (CO)_{2} (g) + 18 H_{2} O (g)$ .

$Δ H = - v e; Δ S + v e; Δ G = + v e$

$Δ H = + v e; Δ S - v e; Δ G = + v e$

$Δ H = - v e; Δ S + v e; Δ G = - v e$

$Δ H = + v e; Δ S + v e; Δ G = - v e$

Q. Which is correct for the combustion reaction occurring in an automobile is 2C8​H18​(s)+25O2​(g)→16(CO)2​(g)+18H2​O(g) .

ΔH=−ve;ΔS+ve;ΔG=+ve

ΔH=+ve;ΔS−ve;ΔG=+ve

ΔH=−ve;ΔS+ve;ΔG=−ve

ΔH=+ve;ΔS+ve;ΔG=−ve

Q. Which is correct for the combustion reaction occurring in an automobile is $2 C_{8} H_{18} (s) + 25 O_{2} (g) \to 16 (CO)_{2} (g) + 18 H_{2} O (g)$ .

$Δ H = - v e; Δ S + v e; Δ G = + v e$

$Δ H = + v e; Δ S - v e; Δ G = + v e$

$Δ H = - v e; Δ S + v e; Δ G = - v e$

$Δ H = + v e; Δ S + v e; Δ G = - v e$