Question

how much thermal energy is produced by burning two moles of octane?

Answer 1

The molecular weight of n-Octane is 114.230, so 2g of moles is 228.46 g. 
(5,470,706 J/g-mol)(2 g-mol)= 10,941,412 Joules

Answer 2

A thermal energy of 10860 kilojoules is produced by burning two moles of octane.

How to calculate the thermal energy released by combustion of octane

The thermal energy ($H$) released by octane, in kilojoules, is the product of amount of moles ($n$) and enthalpy of combustion ($h$), in kilojoules per mole:

$H = n\cdot h$ (1)

If we know that $n = 2\,mol$ and $h = 5430\,\frac{kJ}{mol}$, then the thermal energy of octane is:

$H = (2\,mol) \cdot \left(5430\,\frac{kJ}{mol} \right)$

$H = 10860\,kJ$

A thermal energy of 10860 kilojoules is produced by burning two moles of octane. $\blacksquare$

To learn more on enthalpy, we kindly invite to check this verified question: https://brainly.com/question/1657608