four different liquid compounds in flasks at 20°c are represented above. the table below identifies the…

four different liquid compounds in flasks at 20°c are represented above. the table below identifies the compounds. flask c shows the most particles in the vapor phase. which of the following is not shown in the model but best helps to explain why flask c must contain pentane?\n\n| name | chemical formula | boiling point (°c) |\n| ---- | ---- | ---- |\n| pentane | ch₃ch₂ch₂ch₂ch₃ | 36 |\n| hexane | ch₃ch₂ch₂ch₂ch₂ch₃ | 69 |\n| heptane | ch₃ch₂ch₂ch₂ch₂ch₂ch₃ | 98 |\n| octane | ch₃ch₂ch₂ch₂ch₂ch₂ch₂ch₃ | 126 |\n\na the random motion of the particles within the liquids\nb the relative speeds of the vapor particles in each flask\nc the strength of the intermolecular forces between the particles in the liquids\nd the structural formula of the molecules of the liquid and vapor in each flask

four different liquid compounds in flasks at 20°c are represented above. the table below identifies the compounds. flask c shows the most particles in the vapor phase. which of the following is not shown in the model but best helps to explain why flask c must contain pentane?\n\n| name | chemical formula | boiling point (°c) |\n| ---- | ---- | ---- |\n| pentane | ch₃ch₂ch₂ch₂ch₃ | 36 |\n| hexane | ch₃ch₂ch₂ch₂ch₂ch₃ | 69 |\n| heptane | ch₃ch₂ch₂ch₂ch₂ch₂ch₃ | 98 |\n| octane | ch₃ch₂ch₂ch₂ch₂ch₂ch₂ch₃ | 126 |\n\na the random motion of the particles within the liquids\nb the relative speeds of the vapor particles in each flask\nc the strength of the intermolecular forces between the particles in the liquids\nd the structural formula of the molecules of the liquid and vapor in each flask

Answer

Brief Explanations:

The vapor - liquid equilibrium and the amount of vapor present depend on the intermolecular forces. Compounds with weaker intermolecular forces have higher vapor pressures at a given temperature. Pentane has weaker intermolecular forces (London dispersion forces) compared to hexane, heptane, and octane due to its shorter carbon - chain length. This results in more particles in the vapor phase at 20°C. The strength of intermolecular forces is the key factor in explaining why flask C (with most vapor particles) contains pentane. The random motion of particles in the liquid (A) and the relative speeds of vapor particles (B) do not directly explain why a particular compound is in flask C. The structural formula (D) is shown in the table and is not something not shown in the model that helps explain the situation.

Answer:

C. The strength of the intermolecular forces between the particles in the liquids