10. Consider the reaction 2A + B + 24.0 kJ ------ 2 C + D  with energy of activation of          55.0 kJ. What is the energy of activation for the reaction 2 C + D --- 2 A + B?          A. – 55.0 kJ       B. – 31.0 kJ       C.  79.0 kJ      D.   31.0 kJ      E. 24.0 kJ

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