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Delta H(formation) of urea is given as -333.5Kj/mol find deltaU(internal energy change) of urea

Delta H(formation) of urea is given as -333.5Kj/mol

find deltaU(internal energy change) of urea

Grade:12

1 Answers

Naveen Kumar
askIITians Faculty 60 Points
9 years ago
The rformation of urea can take place as:
2 NH3(g) + CO2(g) → (NH2)2CO(s) + H2O(l)
so using the relation,
dG=dH-TdS, we would get for the chemical reactions as:
dH=dU+RTdn
where dn=number of moles in product side – number of moles in reactant side
so dH=dU-3RT
[3 comes for each one mole of urea formation, change in moles of gaseous components=0-(2+1)]
If we know the absolute temperature of this reaction occured, we can calculate the change in internal energy(dU)

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