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molarity is the number of moles of solute present in one litre of solution and its unit is mole per litre the solute is ferric chloride and M by 30 is the given molarity can be shown as
molarity of fecl_3 is M/30.
no. of moles,n=1/30mole.
number of moles of chloride ion in ferric chloride as 3 chloride ions are present in compound.
as 3 chloride ions are present in fecl_3 which indicates the number of mole of chloride is..
ncl=3/30=1/10mol.
hence,molarity of chloride ion in fecl3 is M/10.
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