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Question

Given, C2H2(g)C2H4(g):ΔH=175 kJ mol1
ΔHf(C2H4,g)=50kJ mol1;ΔHf(H2O,l)=280 kJ mol1;ΔHf(CO2g)=390 kJ mol1
If ΔH is enthalpy of combustion (in kJ mole1 of C2H2(g), then calculate the value of ΔH257

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Solution

C2H2(g)+H2(g)C2H4(g)
Given, ΔHf(C2H4,g)=50 kj mol1
175=(ΔfH)C2H2+50
(ΔfH)C2H2=225 kj mol1
For enthalpy of combustion the corresponding chemical reaction is,
C2H2+52O22CO2+H2O
ΔH=(2×(390)280225) kj mol1=1285 kj mol1
ΔH257=1285257=5 kJmol1

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