What is the heat of combustion of ethane, Cats in kilojoules per mole of ethane?

Question

What is the heat of combustion of ethane, Cats in kilojoules per mole of ethane? Enthalpy of formasion values can be found here. Number kJ/mol ethane For a particular isomer of CsH the following reaction produces 5104 1kJ of heat per mole of 25 A,',',-5104.1 kJ What is the standard enthalpy of formation of this isomer of CaHel9) Number kJ/mol Caloulate the standard darge n Gtos free energyfor the folowing reaction at25. Use teaG., values found in the Chemendix Number kJ/mo Hydrogen peroxide can be prepared in several ways. One method is the reaction between hydrogen and oxygen, another method is the reaction between water and oxygen. Calculate the &G; of each reaction below using values from this table Number kJ mol Number kJ. mol Which method requires less energy under standard conditions? Reaction (1)

Explanation / Answer

Ans 1

Balanced equation

C2H6(g) + 3.5 O2(g) 2CO2(g) + 3H2O(l)

Hc = ?

Heat of combustion

Hc = Hf[products] - Hf[reactants]

Hc(C2H6) = 2 X Hf(CO2) + 3 X Hf(H2O) - Hf(C2H6) – 3.5 X Hf(O2)

Hc(C2H6) = 2 X (-393.5 kJ mol-1) + 3 X (-285.8 kJ mol-1) – (- 84.7 kJ mol-1) – 2 X (0 kJ mol-1)

Heat of combustion Hc(C2H6) = - 1559.7 kJ mol-1

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