Molar mass of benzoic acid = 122.12 g/mol
Moles of benzoic acid that were burnt = mass / molar mass = 1.45 / 212.12 = 6.84 * 10-3 moles
Energy releases = moles * Enthalpy of combustion = 6.84 * 10-3 * 3227 KJ = 6.84 * 10-3 * 3227 * 103 J = 22072.68 J
Heat released by combustion = heat absorbed by water + heat absorbed by calorimeter
22072.68 = moles of water * Specific heat of water * temeprature change + calorimeter constant * temperature change
Moles of water = mass / molar mass = 1700 / 18 = 94.44 moles
22072.68 = 94.44 * 75.3 * 2.82 + C * 2.82
Solving, C = 715.86 J / K = 0.716 KJ/K
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