Calculate the normality. I know the formula of Normality is N=M x number e- (loss/gain). In the equation Cr2O7 ----Cr+3. Ox Cr in Cr2O7 is +6 and ox of Cr in Cr+3 is +3 So the different btw them is 3. and N= M x 3. This is the answer. But do we have to balance the equation first, then number e- gain is 6 not 3? someone help me plz.