For a particular isomer of c8h18, the combustion reaction produces 5104.1 kj of heat per mole of c8h18(g) consumed, under standard conditions. c8h18(g)+252o2(g)⟶8co2(g)+9h2o(g)δh ∘rxn=−5104.1 kj/mol what is the standard enthalpy of formation of this isomer of c8h18(g)?

Explanation:

Hello,

Considering the chemical reaction, the enthalpy of reaction is given by:

ΔH°rxn=ΔfHCO2+ΔfHH2O-ΔfHC8H18

(ΔfHO2=0)

Taking into account that the reaction produces energy, ΔH°rxn is negative. No, solving for ΔfHC8H18:

ΔfHC8H18=-ΔH°rxn+8*ΔfHCO2+9*ΔfHH2O

ΔfHC8H18=-(-5104.1 kJ/mol)+9*(-292.74kJ/mol)+8*(-393.5 kJ/mol)

ΔfHC8H18=-678.56 kJ/mol

Best regards.

A particular isomer of C₈H₁₈, whose combustion reaction produces 5104.1 kJ of heat per mole of C₈H₁₈(g) consumed, has a standard enthalpy of formation of -220.1 kJ/mol.

Let's consider the following thermochemical equation.

C₈H₁₈(g) + 25/2 O₂(g) ⟶ 8 CO₂(g) + 9 H₂O(g)   ΔH°rxn = −5104.1 kJ/mol

We can calculate the standard enthalpy of the reaction (ΔH°rxn) using the following expression.

where,

We will use this equation to calculate the standard enthalpy of formation of this isomer of C₈H₁₈.

A particular isomer of C₈H₁₈, whose combustion reaction produces 5104.1 kJ of heat per mole of C₈H₁₈(g) consumed, has a standard enthalpy of formation of -220.1 kJ/mol.

Learn more:

a plasma is a warm ionized gasoline consisting of approximately equal numbers of definitely charged ions and negatively charged electrons. the characteristics of plasmas are notably unique from the ones of ordinary neutral gases in order that plasmas are considered a awesome "fourth kingdom of remember."

dynamic equilibrium is the answer.