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Trends in Atomic Properties & Physical Properties

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Question

When ethylene is heated with 1.5 moles  of oxygen the heat liberated is 702kJ. Enthalpy of combustion of ethylene is 

Moderate
Solution

C2H4g+3O2g 2CO2g+2H2Ol;ΔH=?

This equation represents  combustion of ethylene

1.5 moles of O2when reacts with ethene liberates 702kJ

3 moles of O2when reacts with ethene liberates _____

ΔHcombustion=2(702)=1404kJ

 


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