unIT 1: PROBLEMS 64. The pyrolysis of ethane proceeds with an activation energy of about 315000 J. How much faster is the decomposition at 650C than500℃? 65. a certain reaction has a rate given b r4=0.005C4,molm If the concentration is to be expressed in mo/ and time in hours what would be the value and units of the rate constant?UNIT 1: PROBLEMS 4.The pyrolysis of ethane proceeds with an activation energy of about 315000 J. How much faster is the decomposition at 650℃ than 500℃? 5. A certain reaction has a rate given by If the concentration is to be expressed in mol/L and time in hours, what would be the value and units of the rate constant? 0.005 , mol/cm min 2 3 =  A CA r