Question: how many atoms are in one molecule of borax?
Answer: The borax anhydrous molar mass is 201.22 g mol-1, while the decahydrate salt molar mass is 381.38 g mol-1. Borax decahydrate is a complex formed by the ion [B4O5(OH)4]-2, which has 4 boron atoms coordinated to 7 oxygen atoms and formed a bicyclic structure.