Question

Calculate ΔS of the surrounding if the standard enthalpy of formation of methanol is − 238.9 kJ mol⁻¹.

Answer 1

Given: Δ_fH⁰ =  − 238.9 kJ mol⁻¹

Standard mean temperature,

T = 25°C = 25 + 273 = 298 K

Now, Δ_surr.S = `(Delta_fH^0)/T`

= `(- 238.9)/298`

= 0.8017 kJK⁻¹

∴ Δ_surr.S = 801.7 JK⁻¹