Hess' Law with formulas of combustion and formation

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romina_4C
Posts: 100
Joined: Thu Jul 11, 2019 12:17 am

Hess' Law with formulas of combustion and formation

Postby romina_4C » Tue Feb 11, 2020 11:53 pm

When writing equations for combustion and formation (and when we need to use their enthalpies/entropies to calculate the entropy or enthalpy of the overall reaction), should I always have the equation forming one mole of the compound in question (other molar coefficients in fractions)?

jisulee1C
Posts: 149
Joined: Thu Jul 25, 2019 12:17 am

Re: Hess' Law with formulas of combustion and formation

Postby jisulee1C » Wed Feb 12, 2020 8:28 am

This would depend on the problem. But for the given enthalpies such as the enthalpy of formation they usually give it in KJ or J/ mol and you can manipulate that value depending on how much reactant they give. If no values are given, 1 mol can be used.


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