Question

In: Chemistry

What are the changes in enthalpy, entropy, and free energy for the hydrogenation of C2H4 to...

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.

Expert Solution

C2H4(g) + H2(g) ---> C2H6(g)

dH^orxn = dH^oproducts - dH^oreactants

= (-84.68) - (52.25)

= -136.93 kJ/mol

dS^orxn = dS^oproducts - dG^oreactants

= (229.6) - (219.45 + 130.684)

= -120.534 J/K.mol

dG^orxn = -136.93 - (298 x -0.120534)

= -95.011 kJ/mol

C3H6(g) + H2(g) ---> C3H8(g)

dH^orxn = dH^oproducts - dH^oreactants

= (-104.5) - (20.2)

= -124.7 kJ/mol

dS^orxn = dS^oproducts - dG^oreactants

= (269.9) - (266.9 + 130.684)

= -127.684 J/K.mol

dG^orxn = -124.7 - (298 x -0.127684)

= -86.65 kJ/mol

queen_honey_blossom answered 8 months ago

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