Question

The exothermic reaction of quicklime with water and the rather small specific heats of both

quicklime (0.946 J/g? °C) and slaked lime (1.20 J/g? °C) make it hazardous to store and

transport lime in vessels made of wood. Wooden sailing ships carrying lime would occasionally

catch fire when water leaked into the hold.

(a) If a 500 g sample of water reacts with an equimolar amount of CaO (both at an initial

temperature of 25°C), what is the final temperature of the product, Ca(OH)2? Assume that

the product absorbs all of the heat released in the reaction.

(b) Given that the standard enthalpies of formation of CaO and H2O are 2635.6 kJ/mol and

2285.8 kJ/mol, respectively, calculate the standard enthalpy of formation of Ca(OH)2.

Answer 1

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