b. Potassium dichromate (K,Cr,0,),
percentage composition
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Potassium Dichromate is K2Cr2O7
total mass = 292
% of K = 39x2/292 = 26.7%
% of Cr = 51x2/292 = 34.9%
% of O = 16x7/292 = 38.4%
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