Enthalpy Change of Formation of MgO: Explained

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The discussion centers on the enthalpy change of formation of magnesium oxide (MgO) and the methodology used to calculate it. The enthalpy change due to hydration is disregarded because it is considered identical in both the reactions involving magnesium and magnesium oxide with hydrochloric acid (HCl), thus canceling out. The process involves first determining the heat capacity of the calorimeter using HCl and sodium hydroxide (NaOH), followed by measuring the enthalpy changes for magnesium and MgO with HCl. This approach allows for a simplified calculation of the enthalpy change of formation. The focus remains on the consistency of hydration effects in both cases.
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Enthalpy change?

Hello, i was reading a book on thermodynamics and notice that when they are trying to find the enthalpy change of formation of MgO, they disregard the enthalpy change due to hydration when Mg is add to aqueous HCL. Why is this so?
 
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Could you elaborate further on the method that they used to determine the enthalpy change of formation of MgO?
 


well at first they calculate the heat capacity of the calriometer by adding HCL to NAOH. then they measure the enthalpy change of Mg with HCL. finally MgO with HCL. then they just use these values and calculate the enthalpy change of formation
 


Same hydration in both cases.

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dont really get it.What do you mean same hydration in both cases?
 


Hydration effect is identical in both cases, so it cancels out.

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