Please answer all parts! Thank you!! Enthalpy H is a measure of the energy conte

Question

Please answer all parts! Thank you!!

Enthalpy H is a measure of the energy content of a system at constant pressure. Chemical reactions involve changes in enthalpy, AH, which can be measured and calculated: where the subscript "rxn" is for "enthalpy of reaction" and T is for "enthalpy of formation" and m and n represent the appropriate stoichiometric coefficients for each substance. The following table lists some enthalpy of formation values for selected substances. Determine the enthalpy for this reaction: Ca(OH)2(s) + CO2(g) rightarrow CaCO3(s) + H2O(l) Express your answer in kilojoules per mole to four significant figures. Consider the reaction Ca(OH)2 (s) rightarrow CaO (s) + H2O(l) with enthalpy of reaction What is the enthalpy of formation of CaO(s)? Express your answer in kilojoules per mole to four significant figures.

Explanation / Answer

Entalapy of this reaction:
Entalapy of formation of products-Entalapy of formation of reactant
=(-1207-285.8)-(-986.1-393.5)
=-113.2kJ/mol

2.

let entalapy of formation of CaO be x
=(x-285.8)-(-986.1)
65.20=(x-285.8)-(-986.1)
=> x=-635.1kL/mol

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