Using the table of bond energies, calculate the energy released (ΔHrxn) from the following reaction: 2H2(g) + O2(g) → 2H2O(g)?

Using the table of bond energies, calculate the energy released (ΔHrxn) from the following reaction:

2H2(g) + O2(g) → 2H2O(g)

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  • 1 month ago

    BOND                 BOND ENERGY KJ/mol

    H-H                                   436

    O=O                                  498

    H-O                                   464

    del H = del H (reactant) - del H (product)

    2H2 +O2 -->2 H2O

    del H reactant = 2 H-H and 1 O=O = 2* 436 +1*498 = 1370 KJ/ mol

    del H product = 4 O-H =4*464 = 1856 KJ/mol

    del H = del H (reactant) - del H (product)

    del H = 1370 - 1856 = - 486 KJ / mol

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