Lime standard enthalpy

The most important contributor to the strength of hardened Portland cement is tricalcium silicate, (Ca0)3-Si02, for which the measured standard enthalpy of formation is — 2929.2 kj moUT Calculate the standard enthalpy change for the production of 1.00 mol tricalcium silicate from quartz and lime. 

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 —635.6 kJ/mol and —285.8 kJ/mol, respectively, calculate the standard enthalpy of formation of Ca(OH)2. 

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