Q. 83.7( 63 Votes )

The reaction of c

Answer :

We know that,

ΔU = ΔH - ΔngRT


The balanced chemical equation of reaction is,


NH2CN(s) + 3/2O2(g) N2(g) + CO2(g) + H2O(l)


Number of moles of gaseous particles in product side is 2 (one N2 and one CO2)


Number of moles of gaseous particles on reactant side is 3/2 (O2)


Thus, change in number of moles of gaseous particle,


Δng = 2 – 3/2 = 1/2


ΔU = ΔH - ΔngRT

Given,

ΔU = -742.7 kJ

R =8.314 J K-1 mol-1

= 8.414 × 10-3 kJ K-1 mol-1

Δng =(2-2.5) =-0.5 mole

T = 298 K

Thus,

ΔH = (-742.7 kJ mol-1) – (1/2mol)×(8.314 × 10-3 kJ K-1mol-1)×298

= -742.7 - 1.239

= -743.9 kJ

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