8.000g of Compound X  with molecular formula  C4H10  are burned in a constant-pressure calorimeter containing  30.00kg  of water at  25°C . The temperature of the water is observed to rise by  2.905°C . (You may assume all the heat released by the reaction is absorbed by the water, and none by the calorimeter itself.) Calculate the standard heat of formation of Compound  X  at

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