Use the table below to answer the questions that follow.
thermodynamic quantities for selected substances at 298.15 k (25°c)
substance δh°f (kj/mol) δg°f (kj/mol) δs (j/k-mol)
carbon
c (s, diamond) 1.88 2.84 2.43
c (s, graphite) 0 0 5.69
c2h2 (g) 226.7 209.2 200.8
c2h4 (g) 52.30 68.11 219.4
c2h4 (g) -84.68 -32.89 229.5
co (g) -110.5 -137.2 197.9
co2 (g) -393.5 -394.4 213.6
hydrogen
h2( g) 0 0 130.58
oxygen
o2 (g) 0 0 205.0
h2o (l) -285.83 -237.13 69.91
the value of δs° for the catalytic hydrogenation of ethene to ethane, c2h4 (g) h2(g) → c2h6 (g)