Solution:
Since the chemical formula of iron (III) ferrocyanide is Fe₄[Fe(CN)₆]₃, the formula mass of iron (III) ferrocyanide can be written as
formula mass = (55.85 amu × 7) + (12.01 amu × 18) + (14.01 amu × 18)
[tex]\boxed{\text{formula mass = 859.3 amu}}[/tex]
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