Chemistry High School

The standard molar enthalpy change for this reaction is -1.3 MJ. What is the enthalpy change when 6 moles of octane are combusted

Answers

Answer 1

The enthalpy change when 6 moles of octane are combusted is -7.8 MJ. This value is obtained by multiplying the standard molar enthalpy change (-1.3 MJ/mol) by the number of moles of octane combusted.

The balanced combustion equation for octane (C8H18) is:

C8H18 + 12.5O2 → 8CO2 + 9H2O

According to the balanced equation, the stoichiometric coefficient of octane is 1, which means that the enthalpy change for the combustion of 1 mole of octane is -1.3 MJ.

To find the enthalpy change when 6 moles of octane are combusted, we can multiply the standard molar enthalpy change by the number of moles of octane:

Enthalpy change = -1.3 MJ/mol * 6 mol

Enthalpy change = -7.8 MJ

Therefore, when 6 moles of octane are combusted, the enthalpy change is -7.8 MJ.

The enthalpy change when 6 moles of octane are combusted is -7.8 MJ. This value is obtained by multiplying the standard molar enthalpy change (-1.3 MJ/mol) by the number of moles of octane combusted. The negative sign indicates that the combustion process is exothermic, releasing energy in the form of heat.

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