Qstnid -4- Δ<i>u</i><sup>θ</sup>of Combustion Of Methane Is - <I>x</i> Kj Mol<sup>-1</sup>. The Value Of Δ<i>h</i><sup>θ</sup> Is (I) = Δ<i>u</i><sup>θ</sup> (Ii) &Gt; Δ<i>u</i><sup>θ</sup> (Iii) &Lt; Δ<i>u</i><sup>θ</sup> (Iv) = 0 - 06: Chemical Thermodynamics - Neet-xi-chemistry

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NEET-XI-Chemistry

06: Chemical Thermodynamics

Qstn# 4 Prvs-Qstn Next-Qstn

#4
ΔU^θof combustion of methane is - X kJ mol^-1. The value of ΔH^θ is
(i) = ΔU^θ
(ii) > ΔU^θ
(iii) < ΔU^θ
(iv) = 0
Ans : Since ΔH^θ = ΔU^θ + Δn_gRT and ΔU^θ = -X kJ mol^-1,

ΔH^θ = (-X) + Δn_gRT.

⇒ ΔH^θ < ΔU^θ

Therefore, alternative (iii) is correct.