Water (H2O) is a liquid at room temperature. Ammonia (NH3) is a gas at room temperature. Both are polar covalent compounds. Which compound most likely has the strongest intermolecular forces?

Water molecules form strong hydrogen bonds because hydrogen is bonded to highly electronegative oxygen. Ammonia also forms hydrogen bonds, but water can form a more extensive network of them. This stronger attraction is consistent with water being a liquid while ammonia is a gas at room temperature, so water has the strongest intermolecular forces.

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