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- What is the enthalpy change when two molecules of methane form one molecule of ethane and one molecule of hydrogen gas?
- A. -369kJ/mol
- B. 45kJ/mol
- C. 392kJ/mol
- D. 481kJ/mol
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- B
- The enthalpy change of the action is equal to the sum of the bond energies of the reactants minus the sum of the bond energies of the products.