I have a worksheet full of Hess\'s Law questions and I was gonethe day we went o

Question

I have a worksheet full of Hess's Law questions and I was gonethe day we went over them. Could someone walk me through the firstone so I can complete this assignment? COg + 1/2NOg -> CO2g +1/2N2g H= ? I know the following: CO + 1/2O2 -> 2NO H1=-283kJ N2 + O2 ->2NO         H2=180.6 kJ Im supposed to calculate the enthalpy of reaction for thefirst equation. I have a worksheet full of Hess's Law questions and I was gonethe day we went over them. Could someone walk me through the firstone so I can complete this assignment? COg + 1/2NOg -> CO2g +1/2N2g H= ? I know the following: CO + 1/2O2 -> 2NO H1=-283kJ N2 + O2 ->2NO         H2=180.6 kJ Im supposed to calculate the enthalpy of reaction for thefirst equation.

Explanation / Answer

I think the required Equation be COg +NOg -> CO2g +1/2N2g   :H= ? CO + 1/2O2 -> 2NO H1=-283kJ is not correct . The correct one is CO + 1/2O2 -> 2NO H1=-283kJ is not correct . The correct one is CO + 1/2O2 -> CO2 : H1= -283 kJ   ---(1) N2 + O2 ->2NO         H2=180.6 kJ   --- ( 2 ) COg + NOg ---> CO2g+ 1/2N2g   :H= ?   ----(3) Eq ( 3 ) can be obtained by Eq ( 3 ) = Eq ( 1 )  + (1/2) *reverse of Eq ( 2)   H = H1 + ( 1/2 ) * (- H2 )          = -283 KJ +0.5 * ( -180.6 KJ )         =      -283 KJ - 90.3         = -373.3KJ   

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