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Width of a water molecule

Updated: 8/10/2023
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13y ago

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The diameter is about 0.29 nm. The atomic diameter can be determined from interpolation of the effective ionic radii of the isoelectronic ions (from crystal data) of O2- (2.80 Å), OH- (2.74 Å) and H3O+ (2.76 Å). Coincidentally, this diameter is similar to the length of a hydrogen bond. The water molecule (bond length 0.96 Å) is smaller than ammonia (bond length 1.01 Å) or methane (bond length 1.09 Å), with only H2 (bond length 0.74 Å) and HF (bond length 0.92 Å) being smaller molecules. Answer from Esteban Broitman, September 7 2008.

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15y ago
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14y ago

Going by the ol' rule of the nano-thumb, there are six water molecules end to end in a nanometer, which is one billionth of a meter. An angstrom is 1/10 of a nanometer. A picometer is 1/1000th of a nanometer. So a single water molecule would be:

1/6th of one billionth of a meter

1.67 angstroms

167 picometers (167 trillionths of a meter)

Or 167 x 10 -12 meters (that's 167 times 10 to the minus 12 meters)

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15y ago

140 Picometer lengthwise

one picometer equals one trillionth (1/1,000,000,000,000) of a metre.

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13y ago

The height of an adsorbed monolayer of water, about 2.5 Angstroms or 2.5*10^-10 meters, is the width of a water molecule.

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8y ago

The molecular diameter of water is 2,75 angstroms.

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16y ago

About 3x10-10m

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15y ago

0.278 nm

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11y ago

3a

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