The final solution should be less than the 100ml. Due to the bent shape and molecular arrangement of water molecules water has significant volume gaps in its liquid form. With ethanol added these gaps are disrupted and the combined expected volume is therefore lower. This is because the ethanol molecules are able to fill in the wide gaps in the molecules of water when the two mix homogeneously.
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Explanation:
The final solution should be less than the 100ml. Due to the bent shape and molecular arrangement of water molecules water has significant volume gaps in its liquid form. With ethanol added these gaps are disrupted and the combined expected volume is therefore lower. This is because the ethanol molecules are able to fill in the wide gaps in the molecules of water when the two mix homogeneously.