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The numbe rof Pottassium atoms in 2 moles of pottassium ferrocyanide is:

2 moles of K4[Fe(CN)6]  = 2  x 6.02  x 10 23 molecules  
                                        = 4x 2 x 6.02  x 1023 atoms of potassium
                                         = 4.816 x 10 22


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