Why is hydration enthalpy ignored in MgO formation experiments?

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semc
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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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