Mr(Fe2O3) = 56*2 + 16*3 = 160
Mr(P2O5) = 31*2 + 16*5 = 142
Mr(Mn2O7) = 55*2 + 16*7 = 222
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Mr(Fe2O3) = 56*2 + 16*3 = 160
Mr(P2O5) = 31*2 + 16*5 = 142
Mr(Mn2O7) = 55*2 + 16*7 = 222