how to use hess's law to solve 3 equations?

  • Thread starter Thread starter Jimmy P.
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Jimmy P.

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N2 + O2 --> 2NO H= +180.7 KJ
2NO + O2 --> 2NO2 H= -113.1 KJ
2N2O --> 2N2 + O2 H= -163.2 KJ

find H of N2O + NO2 --> 3NO

everything is in gas state

can someone please show me how to use hess's law to find the enthalpy change?
 
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