Question

The enthalpy of combustion for octane (C8H18(l)), a key component of gasoline, is -5,074 kJ/mol. This value is the Delta. Hrxn for which of the following reactions? 2C8H18(l) 25O2(g) Right arrow. 16CO2(g) 18H2O(g) C8H18(l) 12. 5O2(g) Right arrow. 8CO2(g) 9H2O(g) 16CO2(g) 18H2O(g) Right arrow. 2C8H18(l) 25O2(g) 8CO2(g) 9H2O(g) Right arrow. C8H18(l) 12. 5O2(g).

Answer 1

Combustion can be defined as the reaction of a compound with oxygen. The enthalpy of combustion of octane is $\Delta H_{\rm rxn}$ for $\rm C_8H_{18}\;+\;25\;O_2\;\rightarrow 8\;CO_2\;+\;9\;H_2O$.

What is the enthalpy of reaction?

The enthalpy of reaction is the amount of heat energy absorbed or lost by the molecules in the chemical reaction.

The enthalpy of combustion is the amount of heat energy released by the compound in the reaction with oxygen.

The reaction in which heat is liberated with the reaction of a compound with oxygen has an enthalpy of combustion, equivalent to the enthalpy of reaction.

The combustion of octane can be given as:

$\rm C_8H_{18}\;+\;25\;O_2\;\rightarrow 8\;CO_2\;+\;9\;H_2O$

Thus, the reaction has combustion energy equivalent to the enthalpy of the reaction is $\rm C_8H_{18}\;+\;25\;O_2\;\rightarrow 8\;CO_2\;+\;9\;H_2O$. Thus, option B is correct.

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