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A \"barrel of oil\" in international trade has a volume of 42 USgallons, or 159 L. How much heat would be released if 159 L of puren-octane (C8H18) was burned completely at constant pressure, andwith products and reactant at 298 K. The standard enthalpy ofcombustion of n-octane is -5471 kJ/mol and its density is 0.703g/cm^3.