+ - Enthalpy Enthalpy H is a measure of the energy content of a system at consta
ID: 854791 • Letter: #
Question
+ - Enthalpy 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 f 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) right arrow CaCO3 (s) + H2O(I) Express your answer in kilojoules per mole to four significant figures. Part B Consider the reaction with enthalpy of reaction What is the enthalpy of formation of CaO(s)? Ca(OH)2(s)right arrow CaO(s) + H2O(1) = 65.20kJ/mol Express your answer in kilojoules per mole to four significant figures.Explanation / Answer
A) (-1207) + (-285.8) - (-986.1) - (-393.5)= -113.2KJ/mol
H2O is in liquid state
B) 65.2 = (-285.8)+Hf(CaO)-(-986.1)
Hf(CaO) = -635.1 KJ/mol
Related Questions
Navigate
Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.