Question

For each pair of substances listed here, choose the one having the larger standard entropy value at 25°C. The same molar amount is used in the comparison.

(a)

Li(s)

Li(l)     

Explain the basis for your choice.

Species with greater molar masses have larger standard entropy.

Species with greater molar masses have lower standard entropy.     

Liquids have larger standard entropy than solids.

Solids have larger standard entropy than liquids.

Inability to hydrogen bond leads to a less ordered arrangement of the system and therefore higher standard entropy.

Hydrogen bonding leads to a more ordered arrangement of the system and therefore larger standard entropy.

(b)

CH₃OCH₃(l)

C₂H₅OH(l)     

Explain the basis for your choice.

a - Species with greater molar masses have larger standard entropy. b - Species with greater molar masses have lower standard entropy. c- Liquids have larger standard entropy than solids.d - Solids have larger standard entropy than liquids. e- Inability to hydrogen bond leads to a less ordered arrangement of the system and therefore higher standard entropy.Hydrogen bonding leads to a more ordered arrangement of the system and therefore larger standard entropy.

(c)

Ar(g)

Xe(g)     

Explain the basis for your choice.

a- Species with greater molar masses have larger standard entropy.b- Species with greater molar masses have lower standard entropy. c- Liquids have larger standard entropy than solids. d- Solids have larger standard entropy than liquids. e- Inability to hydrogen bond leads to a less ordered arrangement of the system and therefore higher standard entropy. f- Hydrogen bonding leads to a more ordered arrangement of the system and therefore larger standard entropy.

(d)

CO(g)

CO₂(g)     

Explain the basis for your choice.

a- Species with greater molar masses have larger standard entropy.b- Species with greater molar masses have lower standard entropy. c- Liquids have larger standard entropy than solids.d- Solids have larger standard entropy than liquids. e- Inability to hydrogen bond leads to a less ordered arrangement of the system and therefore higher standard entropy. f- Hydrogen bonding leads to a more ordered arrangement of the system and therefore larger standard entropy.

(e)

O₂(g)

O₃(g)     

Explain the basis for your choice.

a- Species with greater molar masses have larger standard entropy. b- Species with greater molar masses have lower standard entropy. c- Liquids have larger standard entropy than solids.d- Solids have larger standard entropy than liquids. e- Inability to hydrogen bond leads to a less ordered arrangement of the system and therefore higher standard entropy.y. f- Hydrogen bonding leads to a more ordered arrangement of the system and therefore larger standard entropy.

(f)

N₂O₄(g)

NO₂(g)     

Explain the basis for your choice.

a- Species with greater molar masses have larger standard entropy.b- Species with greater molar masses have lower standard entropy. c- Liquids have larger standard entropy than solids.d- Solids have larger standard entropy than liquids.e-Inability to hydrogen bond leads to a less ordered arrangement of the system and therefore higher standard entropy.f- Hydrogen bonding leads to a more ordered arrangement of the system and therefore larger standard entropy.

NO FURTHER EXPLANATION NEEDED JUST ANSWERS

Answer 1

Ans

Entropy refers to the degree of disorderness or randomness of the system . The factors such as physical state , temperature , pressure and the molar masses of the compounds affect this property.

a) Li (l)

Liquids have larger standard entropy than solids.

b) CH3OCH3 (l)

Inability to hydrogen bond leads to a less ordered arrangement of the system and therefore higher standard entropy.

c) Xe (g)

Species with greater molar masses have larger standard entropy.

d) CO2 (g)

Species with greater molar masses have larger standard entropy

e) O3 (g)

Species with greater molar masses have larger standard entropy.

f) N2O4 (g)

Species with greater molar masses have larger standard entropy.