Solution of task 89 of Chemistry Book Shimanovich 2003

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89. The heat effect of what reaction is equal to the heat of formation of calcium hydroxide?
Calculate the heat of formation of calcium hydroxide, based on the following thermochemical equations:
Ca (k) + 1 / 2O2 (r) = CaO (k); H = -635.60 kJ.
H2 (r) + 1 / O2 (r) = H2O (x); H = -285.84 kJ.
CaO (k) + H2O (x) = Ca (OH) 2 (k); H = -65.06 kJ.

Answer: -986.50 kJ.


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