🌪️ Entropy Mixing (2D)

Mole fraction x_A: 0.50 Temperature T: 298 K Interaction ε: 0 J/mol Show ΔH contribution

ΔS_mix (J/mol·K)—

ΔG_mix (kJ/mol)—

ΔH_mix (kJ/mol)—

T (K)—

Mixing spontaneous?—

ΔS_mix = −nR(x_Aln x_A + x_Bln x_B). For ideal gases entropy of mixing is always positive, so ΔG_mix = ΔH_mix − TΔS_mix < 0 and mixing is spontaneous. A positive Margules ε (repulsive interaction) can push ΔG_mix back up and cause phase separation at low T.