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March 25, 2017

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What energy change is associated with the reaction to obtain one mole of H2 from one mole of water vapor? The balanced equation is 2 H2O(g) -> 2 H2(g) + O2(g)and the relevant bond energies are
H-H : 436 kJ/mol; H-O : 467 kJ/mol;
O-O : 146 kJ/mol; O=O : 498 kJ/mol.
1. +249 kJ
2. −436 kJ
3. +425 kJ
4. −425 kJ

  • AP Chem - ,

    It appears to me that we must break 4 OH bonds for the two moles H2O and form 2 H-H bonds and 2 O-O bonds. The difference between (sum bond energies reactants)-(sum bond energies products) = delta H rxn for 2 moles H2O and 2 moles H2. Therefore, divide that number by 2. Check my thinking.

  • AP Chem - ,

    the answer i -436

  • AP Chem - ,

    lisa that isnt the right answer lol... it is actually -436... stupiddddd

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