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Q.

Which of the following holds good to the laws of thermodynamics for the reaction? C2H4(g)+3O2(g)2CO2(g)+2H2O(l)

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a

ΔH=ΔE+2RT

b

ΔH=ΔE+RT

c

ΔH=ΔE-RT

d

ΔH=ΔE-2RT

answer is D.

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Detailed Solution

In thermodynamic reaction,

ΔH=ΔE+ΔnRT

Where, ΔH is the enthalpy change, ΔE is the internal energy change, Δn is the number of gaseous moles of product - number of gaseous moles of reactant. And R and T are the gas constant and temperature respectively.

The reaction given is C2H4( g)+3O2(g)2CO2(g)+2H2O(l)

The number of gaseous moles of product =2 and the number of gaseous moles of reactant = 3+1=4

So, Δn=2-4=-2

So, the equation for the given reaction is ΔH=ΔE-2RT.

Therefore, option (D) is correct.

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