Consider the following reaction between oxides of nitrogen N

Consider the following reaction between oxides of nitrogen: NO2(g) + N2O(g) ---> 3NO(g)

1)   Calculate Delta G at 800 K, assuming that Delta H and Delta S do not change with temperature.

2)   Calculate Delta G at 1000 K.

Solution

1) dG = 3dH NO -dH N2O-dGNO2 -800( 3dSNO -dSN2O-dSNO2) =3(90.29)-82.05-34 -800/1000( 3x210.86 -219.96-240) = 16.724 KJ 2) dG = 3(90.29)-82.05-34 -1000/1000(3x210.86-219.96-240) = - 17.8 KJ