Use the standard reaction enthalpies given below to determine ΔH°rxn for the following reaction:

2 NO(g) + O2(g) → 2 NO2(g), ΔH°rxn = ?

N2(g) + O2(g) → 2 NO(g), ΔH°rxn = +183 kJ

1/2 N2(g) + O2(g) → NO2(g), ΔH°rxn = +33 kJ

  1. 👍 1
  2. 👎 0
  3. 👁 8,010
  1. Reverse equation 1 (change sign of delta H).
    Multiply equation 2 by 2.
    Check the equation to make sure that's what you get.

    1. 👍 2
    2. 👎 0
  2. 133

    1. 👍 1
    2. 👎 10
  3. -183+66=-117

    1. 👍 14
    2. 👎 1

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