Mr(H2Cr2O7) =1*2 + 52*2+16*7 =218
Mr(HClO3)=1+35,5 + 16*3 =84,5
Mr(KNO2) = 39+14+16*2=85
Mr(Ca3(PO4)2) = 40*3 + 31*2+16*8=310
Mr(CsClO4) =133 + 35,5 + 16*4=232,5
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Mr(H2Cr2O7) =1*2 + 52*2+16*7 =218
Mr(HClO3)=1+35,5 + 16*3 =84,5
Mr(KNO2) = 39+14+16*2=85
Mr(Ca3(PO4)2) = 40*3 + 31*2+16*8=310
Mr(CsClO4) =133 + 35,5 + 16*4=232,5