Show that hydrogen peroxide (H2O2) is a liquid at 25°C by using the data below. ΔHf°...

Question

Question

Show that hydrogen peroxide (H₂O₂) is a liquid at 25°C by using the data below.

ΔH_f° (kJ mol^-1) data: H₂O₂(l) = –187.8; H₂O₂(g) = –136.3

S^o (J mol^-1 K^-1) data: H₂O₂(l) = 110; H₂O₂(g) = 233

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Answer 1

Answer #1

H2O2 (l) -----------> H2O2 (g)

ΔH°rxn = ΔH_f° products - ΔH_f° reactants

= - 136.3 - (- 187.8)

= 51.5 kJ

ΔSorxn = 233 - 110

= 123 J/K

ΔGo = ΔH - T ΔS

0 = ΔH - T ΔS

T = ΔH / ΔS = 51500 / 123

T = 418.7 K

boiling point = 145 oC

the estimated boiling point is more than room temperature. so

this is liquid .

Answer 2

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