Question

For each pair of substances, circle the one with the higher standard molar entropy (S°) at 25 °C. Explain

a. I(s) or I(g) Reason:________________________________________________________

b. C(s, diamond) or C(s, graphite) Reason:_______________________________________

Answer 1

Entropy corresponds to the randomness of a system. As we move solid gas from - liquid state of any substance, forces of attraction between molecules become weaker & randomness increases & So thus the entropy. (a) I (s) os I (9) atonis OY • I (9) will have higher molar en entropy Reason: Because, gaseous state atoms randomness than solid state. exhibit greater

(6) entropy. hybridized that meany 3 c(s, diamond) or ((s, graphite)? » Ces graphite) has higher standard molar Reasmi In (Ls, diamond) structure, carbon is sp3 its all valence electrons involved in Covalent bonding to form a hard and rigid structure. However, in Cis, graphite), Carbon is spl hybridized in which only valence elections of carbon involved in bonding and one electron is left free on Carbon. This free electron is de localized in whole structure of graphite which it soft in nature and therefore, it is also used as lubricants. Due to this softness and lubricant nature, (1, gropuite) has higher molar entropy thou C(s, diamond). are each the makes