Question

Which substance would have the greatest standard molar entropy?

NO2(g)
N; (g)
N20
NO20​

Answer 1

Among the given substances,
`NO_2`(g) generally has the highest standard molar entropy because it is in the gaseous state and has more atoms, thus a larger number of microstates.

Step-by-step explanation:

Molar entropy is a measure of the number of energy states (microstates) available to a mole of substance under standard conditions. Generally, the more complex the molecule and the higher the number of gaseous particles, the higher the entropy. Considering the molecular structures and states of matter,
`NO_2`(g) generally would have the highest entropy because it is a gaseous species with more atoms and possible microstates compared to the other options.

Answer 2

Option A

Step-by-step 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