Change in enthalpy when six grams of Nitric oxide decomposes to Nitrogen and Oxygen is -18 kJ. Enthalpy of formation of Nitric oxide is

Change in enthalpy when six grams of Nitric oxide decomposes to Nitrogen and Oxygen is -18 kJ. Enthalpy of formation of Nitric oxide is

  1. A

    + 180 kJ

  2. B

    - 180 kJ

  3. C

    + 90 kJ

  4. D

    - 90 kJ

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    Solution:

    12N2g+12O2gNOg , fH=? NOg12N2g+12O2g , H=? 6 grams                                      H=-18 kJ 30 grams                                    H=-90 kJ ; 12N2g+12O2gNOg , fH=+90 kJ ;                               

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