When comparing C3H8 to C9H10 regarding boiling point, vapor pressure and freezin

Question

When comparing C3H8 to C9H10 regarding boiling point, vapor pressure and freezing point, which of the following statements is true?

A) C3H8 has a higher boiling point, higher vapor, and higher freezing point than C9H10

B) C3H8 has a higher boiling point, higher vapor pressure, and lower freezing point than C9H10

C) C3H8 has a higher boiling point, lower vapor pressure, and lower freezing point than C9H10

D) C3H8 has a lower boiling point, lower vapor pressure, and lower freezing point than C9H10

E) C3H8 has a lower boiling point, higher vapor pressure, and lower freezing point than C9H10

What characteristics of C3H8 and C9H10 can you use to determine the answer?

Explanation / Answer

C3H10 has lesser molar mass as compared to C9H10

So, London dispersion forces will be lesser in C3H10 as compared to C9H10

Due to this, C9H10 will exert greater intermolecular forces as compared to C3H8

So,

boiling point and melting will be high for C9H10 since they depends directly on intermolecular forces

vapour pressure will be low for C9H10 since it depends inversely to strength of intermolecular forces

Answer: E

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