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The standard water molecular weight is 18 = O16 + 2H1.

Tritium (H3) exists, but the half life is 12.3 years. O18 is the heaviest of the stable istopes of oxygen. Combining it with tritium yields an Atomic Mass of 24.

Oxygen 24 has a half life of 61 milliseconds, so you could very briefly get a water molecule with an atomic weight of 30. There may be an oxygen isotope as heavy as 26, though its half life is unknown.

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