Question

Which is the correct order of increasing standard molar entropy for the noble gases?

He ≤ Ne ≤ Kr ≤ Ar

He ≤ Ne ≤ Ar ≤ Kr

Ne ≤ He ≤ Ar ≤ Kr

Kr ≤ Ar ≤ Ne ≤ He

Answer 1

The correct order of increasing standard molar entropy for the noble gases is He ≤ Ne ≤ Ar ≤ Kr

Step-by-step explanation:

Entropy is the measure of degree of disorderliness or randomness of a substance. Entropy increases with increasing number of electron present in an atom due to increased repulsive force of the electrons. Therefore, the standard entropy of a substance increases with an increase in their atomic masses.

For the given noble gases in this question, Helium (He) has the least atomic mass while Krypton (Kr) has the highest atomic mass.

Thus, the correct order of increasing standard molar entropy for the noble gases is He ≤ Ne ≤ Ar ≤ Kr