Question

how can you get half a water molecule ?​

Answer 1

Note that it is not possible to have a half a molecule of water. The Formula actual means that two molecules ( or two formula units ) of CaSO4 share one moecule of water so that the effective water of crystallisation for one CaSO4 unit comes to half molecule of water.

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Answer 2

Answer:

FIRST OF ALL GETTING HALF OF A MOLECULE IS NOT POSSIBLE....