Arrange the following substances in the order of increasing entropy at 25^$\circ$C.HF(g) , NaF(s) , SiF₄(g) , SiH₄(g) , Al(s)
lowest $\rarr$ highest

Question

Arrange the following substances in the order of increasing entropy at 25^$\circ$C.HF(g), NaF(s), SiF₄(g), SiH₄(g), Al(s) lowest $\rarr$ highest A) SiF₄(g) < SiH₄(g) < NaF(s) < HF(g) < Al(s) B) HF(g) < Al(s) < NaF(s) < SiF₄(g) < SiH₄(g) C) Al(s) < NaF(s) < HF(g) < SiH₄(g) < SiF₄(g) D) Al(s) < HF(g) < NaF(s) < SiF₄(g) < SiH₄(g) E) NaF(s) < Al(s) < HF(g) < SiF₄(g) < SiH₄(g)

Quizplus · Accepted Answer

Entropy generally increases from solids to liquids to gases, and within gases, more complex molecules have higher entropy. Al(s) is a solid with a simple structure, thus has the lowest entropy. NaF(s) is also a solid but more complex than a pure metal. HF(g) is a simple diatomic gas, so its entropy is higher than that of solids. SiH4(g) and SiF4(g) are both gases, but SiF4(g) is more complex due to the presence of fluorine atoms, making its entropy the highest.

Arrange the Following Substances in the Order of Increasing Entropy ∘\circ∘

Arrange the Following Substances in the Order of Increasing Entropy $\circ$