Questiоn 2 Cоntinued... c The student uses а tаble оf аverage bond energies to calculate another value for the molar enthalpy of combustion of methane. Bond C - H O = O C = O H - O Average bond energy in kJ/mol 412 496 743 463 The equation for the combustion can be shown using displayed formulae. See addendum under Question 2. Figure 2c. ci Use values from the table to calculate the energy taken in when the bonds in the reactants are broken. (2) energy taken in = ........................................................... kJ cii Use values from the table to calculate the energy given out when the bonds in the products are formed. (2) energy given out = ........................................................... kJ ciii Use your answers to (i) and (ii) to calculate the molar enthalpy change for the combustion of methane. (1) molar enthalpy change = ........................................................... kJ/mol [5]
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