The molar heat capacity of ethane is represented in the temperature range of 298K to 400K by the empirical expression Cp,m/(JK-1mol-1)=14.73+0.1272(T/K). The corresponding expressions for C(s) and H2(g) are of the form Cp,m(J-1mol-1)=a+bT+c/T2 where a, b, and c are 16.86, 4.77x10-3, and -8.54x105 for C(s) and 27.28, 3.26x10-3, and 0.50x105 for H2(g). Calculate the standard enthalpy of formation of ethane at 350K from its value at 298K.