The Mean Bond Enthalpy of a P-Cl Bond Is 331

question 4

Multiple Choice

The mean bond enthalpy of a P-Cl bond is 331 kJ mol^-1 and of a Cl-Cl bond is 242 kJ mol^- at 298 K. If the mean standard enthalpy of atomization of white phosphorus is 315 kJ mol^-1, estimate the standard enthalpy of formation of gaseous phosphorus trichloride, PCl₃, at this temperature.

• A) -315 kJ mol^-1
• B) +226 kJ mol^-1
• C) +1671 kJ mol^-1
• D) -1041 kJ mol^-1

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