28. t 3.61 points Ch. Ex. 137b- of Formation of Ca(OH)2 1 out of 3 attempts Lime

Question

28. t 3.61 points Ch. Ex. 137b- of Formation of Ca(OH)2 1 out of 3 attempts Lime is a term that includes calciam oxide (CaO, also called quicklime) and calcimm kydroside Assistance (Ca(OH)2 also called slaked lime). It is ased in the steel indastry to remove acidic imparities, in air-pollution costrol to remove acidic osides such as SQ, and in water treatuest. Slaked lise in produced by treating quicklime with water: AH--65.2 kJml Given the standard enthalpies of formation of CaO and H20 are -635.6 kJ/mol and -285s kJ/mol, respectively, calcalate the standard enthalpy of formation of Ca(OH) kJ/mol

Explanation / Answer

consider the given reaction

CaO + H2O ----> Ca(OH)2

by definiton

dHo rxn = (dHof Ca(OH)2 ) - ( dHof CaO + dHof H2O)

given

dHo rxn = -65.2 kJ/mol

dHof CaO = -635.6 kJ/mol

dHof H2O = -285.8 kJ/mol

plug in the values

-65.2 = dHof Ca(OH)2 - ( -635.6 - 285.8)

dHof Ca(OH)2 = -986.6 kJ/mol

so

the standard enthalpy of formation of Ca(OH)2 is -986.6 kJ/mol

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