Question

Liquid butane (C4H10) has a higher heating value of 43,789 KJ/kg at 298 K and enthalpy of vaporization of 363 kJ/kg. Calculate the enthalpy of formation for butane vapour at 298 K. Show all the calculation steps.

Answer 1

Higher heating Value Step: 1 biven, of Butame, Hy : 43789 Kllag Molecular weight of Butone, Mw 43789 KJ + 58+10 mg/mol Negative because 19539.762 kJ/mol 58410 Reglamol HX 2 baby Energy is given out | HA 363 kJ / kg Enthalpy of Vapeurization, Allu 363 KJ + 5€ + 10% kalmas 2 big AHV 21.05 kJ/mol 2 of • Enthalpy Higher Heating Value (H1) Heat) of Combustion + Enthalpy of Vapourigation

HH Dhe AHN -9539.762 KT: mol Alle + 21.05 kJ / rool Alle 2 -2560.81 KJ1 mol This is Enthalpy of combustion.

Sted: 2 Reaction, + HIO +6.50, SH2O + 4002 Enthalpy of formation of Water (Gossous) 2 H₂O -241.820 kJ/mol CO2 Enthalpy of formation of All con AH -39'3.5 kJ/mol

Enthalpy of of combustion Alte A; 4) products reactants o AG H All Cho bislation 5 Afh + Af HH2O Alte as 4 DG H con .

-qss. 80 81 ve + A[-343-s] , 820] KI/mol -Ке исчин - Sko.80 — 1909. — IS14 Af Healio Д.А., – 228. 3 KZ/mn 16 This is the Enthalpy of formation of Butane Vahaur at 298k.