Problem: Calcium oxide and water react in an exothermic reaction:CaO(s) + H2O(l) → Ca(OH)2(s)       Heat of reaction (Rxn) = -64.8 kJ/molHow much heat would be liberated when 7.15 g CaO(s) is dropped into a beaker containing 152 g H2O.a. 1.97 x 103 kJb. 508 kJc. 8.26 kJd. 547 kJe. 555 kJ

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Concept: Thermochemical Equation 

Thermochemical equations relate heat to stoichiometry. Notice that it takes 1 mole of CaO to release 64.8 kJ of energy. 

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Problem Details

Calcium oxide and water react in an exothermic reaction:

CaO(s) + H2O(l) → Ca(OH)2(s)       Heat of reaction (Rxn) = -64.8 kJ/mol

How much heat would be liberated when 7.15 g CaO(s) is dropped into a beaker containing 152 g H2O.

a. 1.97 x 103 kJ

b. 508 kJ

c. 8.26 kJ

d. 547 kJ

e. 555 kJ

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