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Entropy

Which of the ...

Question

Which of the following pair would correct inequality for standard molar entropy?

N O (g) < {N O}_{2} (g)

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C_{2} H_{2} (g) > C_{2} H_{6} (g)

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{C H}_{3} C O O H (I) < H C O O H (I)

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{C O}_{2} (g) < C O (g)

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Solution

The correct option is A $N O (g) < {N O}_{2} (g)$
$N O$ is linear whereas $N O_{2}$ has more than one resonance structures. Thus molar entropy of $N O$ is less than that of $N O_{2}$ . Molar entropy $= K \times N$ $l n W$ ,
where, $N$ is the no of resonance structures, $K :$ Boltzmann constant, $W :$ Thermodynamic probability

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