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Hess law of constant summation

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Question

Standard enthalpies of formation of CO2, H2O and C2H4 are -396 kJ/mole - 288 kJ/mole and +52 kJ/ mole respectively. Enthalpy of combustion of Ethene is 

Moderate
Solution

Given

Cs+O2g CO2g;ΔH=396kJ1H2g+12O2g H2Og;ΔH=288kJ22Cs+2H2g C2H4g;ΔH=+52kJ3

Required

C2H4g+3O2g 2CO2g+2H2Ol;ΔH=?

2×Eq1+2Eq2Eq3

ΔH=2396+2288+52

=79257652

=1420kJ/mole

 


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Three thermochemical equations are given below. Based on  the data the correct relation is 

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