Which substance would have the greatest standard molar entropy?
NO2(g)
N; (g)
N20
NO20

The substance that would have the greatest standard molar entropy is :   (A )  :   NO₂ ( g )

Standard molar entropy is the measurement of the the randomness ( entropy ) of one mole of a substance. The complexity of a substance determines the value of its molar entropy.

From the options listed the most complex substance is NO₂ whose structure is a trigonal planar while other substances have linear structures. Therefore the substance with the greatest standard molar entropy is NO₂.

Hence we can conclude that The substance that would have the greatest standard molar entropy is : NO₂ ( g ).

Learn more : link

Option A

Explanation:

Standard molar entropy determines the randomness of a mole of substance. Thus, the larger and complex a molecule is, the larger will be its molar entropy.  

The molar entropy of gases is higher than liquids which is turn is higher than solid.  

Here , NO2 is a gas with higher complex structure (trigonal planar) than N2 (linerar), N2O (linear) and N2O2 (linear)

Hence, NO2(g) will have greatest standard molar entropy  

Option A is correct