Question

1,已知298k时,反应：CO2(g) + H2(g) = CO(g) + H2O(g),有关热力学数据如下：

Answer 1

△rH=∑△fH

=(-110.5-241.8)-(-393.5+0)

=41.2 (kJ/mol)

△S=∑S

=(197.9+188.7)-(213.7+130.6)

=42.3 (J/mol.K)=0.0423 (kJ/mol.K)

△rG=△rH-T△S

=41.2-298*0.0423

=28.6 (kJ/mol)

△rG=-2.30RTlgK

=> lgK=-△rG/(2.30RT)

=-28.6/(2.30*0.00831*298)

=-5.0

=> K=10^(-5)