You are working in a laboratory that has justdiscovered the new element Elmonium

Question

You are working in a laboratory that has justdiscovered the new element Elmonium, El. You are given the task ofestimating the bond energy of hydrogen elmonide, HEl. You decide toreact HEl with ethene, C2H4, to produceelmonoethane, CH2ElCH3. If the energy changefor the reaction is -116 kJ, calculate the bond energy of H-El inkJ/mol. Previous work in your laboratory determined the C-El bondenergy to be 278 kJ/mol. Use the table of bond energies and thereaction below to assist your work. Enter your answer as a wholenumber and without units. Bond
Bond Energy(kJ/mol)
C=C
602
C-C
346
C-H
413
C-El
278
d

Explanation / Answer

We Know that :         The given Reactionis :        C2H4 + HEI ----------> CH2ElCH3       Hrxn. = Bond energies of reactants - Bond energiesof products       -116 kJ = [ 602 + 4 x 413] kJ + HEI - [ 278 + 346 + 5 ( 413 ) ] kJ       Bond dissociation energy of HEI=   319kJ /mol

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