Answer to Question #165101 in Physical Chemistry for Harsha

Question

Two Block of BCC iron 1 mole each are kept in thermal contact with each other and they are packed in an adiabatic enclosure first block wast at 300 k and second was at 900 k to start with what should be entropy produced ?

Answer 1

T_f = ½ (T₁+T₂) = ½ (300+900) = 600 K

ΔS₁ = nC_p ln (T_f / T₁) = C_p ln (T_f / T₁) – 1 mol

ΔS₂ = nC_p ln (T_f / T₂) = C_p ln (T_f / T₂) – 1 mol

ΔS _total = ΔS₁ + ΔS₂ = C_p ln (T_f² /T₁T₂)

C_p = 24.3 J/mol K

ΔS _total = 24.3 ln(600²/300x900) = 6.99