The combustion of pentane, c5h12, occurs via the reaction
c5h12(g)+8o2(g)→5co2(g)+6h2o(g)
with heat of formation values given by the following table:
substance δh∘f
(kj/mol)
c5h12 (g) -119.9
co2(g) −393.5
h2o(g) −241.8
calculate the enthalpy for the combustion of 1 mole of pentane.

Answer : The enthalpy for the combustion of 1 mole of pentane is -3024.8 kJ

Explanation :

Enthalpy change : It is defined as the difference in enthalpies of all the product and the reactants each multiplied with their respective number of moles. It is represented as

The equation used to calculate enthalpy change is of a reaction is:  

The equilibrium reaction follows:

The equation for the enthalpy change of the above reaction is:

We are given:

Putting values in above equation, we get:

Therefore, the enthalpy for the combustion of 1 mole of pentane is -3024.8 kJ

solute : a solute is a substance that is dissolved in another substance is known as a solvent. it is mixed with a special mixture know as homogeneous mixture.

solvent: a solvent is a substance that dissolved a solute, which results in a solution is known as solvent.