Urea n2h4co is a waste product from protein

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Unformatted text preview: ibbs free energies of formation is illustrated with this example. Urea, N2H4CO, is a waste product from protein metabolism. Urea may be synthesized from its constituent elements as follows: C ( gr ) + N2 ( g ) + 2H 2 ( g ) + 1 O2 ( g ) ! N2 H 4CO ( s ) 2 Calculate !G ! for urea using standard entropies. For urea "H ! = !332.96kJmol !1 f f C(gr) N2(g) O2(g) H2(g) urea ! !1 !1 5.69 191.49 205.03 130.59 104.60 S JK mol ( ) )( )( )( )( )( !S !f = 1mol 104.60 JK "1mol "1 " 1mol 5.69 JK "1mol "1 " 1mol 191.49 JK "1mol "1 ( )( ) " 2mol 130.59 JK "1mol "1 " (0.5mol )(205.03) = "456.28 JK "1 ( )( ) # !G !f = !H !f " T !S !f = "332960 J " 298.15K "456.28 JK "1 = "196920 J ( )...
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