Water’s molar mass is 18.01 g/mol. The molar mass of methanol is 32.01 g/mol. At room temperature, water is 64% more viscous than methanol. Which substance has the stronger intermolecular attraction?

Water is more viscous than methanol at room temperature: it is 64% more viscous. Greater viscosity indicates stronger intermolecular attractions because the molecules resist flowing past one another more; therefore, water has the stronger intermolecular attraction, even though its molar mass is lower.

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