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Propane is a gas and has extremely low viscosity.

Propan-1-ol has 1 OH group and can hydrogen bond and is higher viscosity.

Ethane-1,2-diol has two OH groups and double the tendency to hydrogen bond and is much higher viscosity.

Propane-1,2,3-triol is also known as glycerin/glycerol and is almost like a syrup as it has such high viscosity. This is because it has 3 OH groups and thus 3 sites for hydrogen bonding.

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10y ago
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6mo ago

Hydrogen bonds increase the viscosity of a substance by increasing the intermolecular forces between the molecules. Propan-1-ol, with one hydroxyl group, experiences moderate hydrogen bonding and has a higher viscosity than ethane-1,2-diol, which has two hydroxyl groups and more hydrogen bonding. Propane-1,2,3-triol has the highest viscosity due to the three hydroxyl groups and extensive hydrogen bonding.

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Q: How do hydrogen bonds affect the viscosities of propan-1-ol ethane-12-diol and propane-123-triol?
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