In: Chemistry
What are the changes in enthalpy, entropy, and free energy for the hydrogenation of C2H4 to C2H6, and C3H6 to C3H8 at 25 degrees C.
C2H4(g) + H2(g) ---> C2H6(g)
dHorxn = dHoproducts - dHoreactants
= (-84.68) - (52.25)
= -136.93 kJ/mol
dSorxn = dSoproducts - dGoreactants
= (229.6) - (219.45 + 130.684)
= -120.534 J/K.mol
dGorxn = -136.93 - (298 x -0.120534)
= -95.011 kJ/mol
C3H6(g) + H2(g) ---> C3H8(g)
dHorxn = dHoproducts - dHoreactants
= (-104.5) - (20.2)
= -124.7 kJ/mol
dSorxn = dSoproducts - dGoreactants
= (269.9) - (266.9 + 130.684)
= -127.684 J/K.mol
dGorxn = -124.7 - (298 x -0.127684)
= -86.65 kJ/mol