Question Part Use a table of bond energies to estimate the enthalpy change in ea

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Question Part Use a table of bond energies to estimate the enthalpy change in each of the following reactions:

I have all the answers except for the second equation, can anyone please help?
Reaction H (kJ) H2CBr2(g) + F2(g)  H2CF2(g) + Br2(g) ICH3(g) + H2O(g)  H3COH(g) + HI(g) HCCH(g) + 2H2(g)  H3C-CH3(g) CH4(g)  C(g) + 2H2(g)

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Question Part Use a table of bond energies to estimate the enthalpy change in each of the following reactions:

I have all the answers except for the second equation, can anyone please help?
Reaction H (kJ) H2CBr2(g) + F2(g)  H2CF2(g) + Br2(g) ICH3(g) + H2O(g)  H3COH(g) + HI(g) HCCH(g) + 2H2(g)  H3C-CH3(g) CH4(g)  C(g) + 2H2(g)

Use a table of bond energies to estimate the enthalpy change in each of the following reactions:

I have all the answers except for the second equation, can anyone please help?
Reaction H (kJ) H2CBr2(g) + F2(g)  H2CF2(g) + Br2(g) ICH3(g) + H2O(g)  H3COH(g) + HI(g) HCCH(g) + 2H2(g)  H3C-CH3(g) CH4(g)  C(g) + 2H2(g)

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Explanation / Answer

for second eq

dH reaction = 3 (C-H) + C-I + 2O-H - 3 (C-H) -(C-O) - (O-H) - (H-I)

= C-I + O-H -C-O -O-H - H-I

= 240 + 463 - 358 - 299

= 46 KJ/mol

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