Question

Arrange the following in order of increasing entropy (low entropy-1 to high entropy-3):

C3H8(g)

CH4(g)

C2H6(g)

Answer 1

Entropy(S) is the measure of randomness or disorder of molecule

increasing order of entropy CH₄ (g) < C₂H₆(g) < C₃H⁸ (g)

low Entropy —1 < Entropy—2 < high Entropy — 3

larger molecules have more entropies than smaller molecules,

because Larger molecules have more ways to randomly distribute energy at a given temperature

here, C₃H₈ (g) is larger molecule so have high Entropy — 3

CH₄ (g) is smaller molecule so have low Entropy —1

Therefore, order of entropy is CH₄(g) < C₂H₆(g) < C₃H₈ (g)