Problem: Compare the viscosity of neopentane, (CH3)4C, and n-pentane.

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FREE Expert Solution

Recall: Viscosity is the resistance of a fluid to flow. Generally, viscosity increases with:

– decreasing temperature
– increasing molar mass
– stronger intermolecular forces

Neopentane and n-pentane are isomers, compounds with the same molecular formula but different structure. They both have the same molecular formula, C5H12. This means we can ignore their molar mass when comparing viscosity.

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Problem Details

Compare the viscosity of neopentane, (CH3)4C, and n-pentane.

A model shows n-Pentane (C5H12), which is a linear chain of carbon and hydrogen. Its boiling point is 309.4 Kelvin. Linear molecules have larger surface area that enhances intermolecular contact and increases dispersion force.Neopentane has the same structural formula has n-Pentane (C5H12), but it has a spherical shape and a lower boiling point (282.7 Kelvin). In spherical molecules, smaller surface area diminishes intermolecular contact and decreases dispersion force.