Cl2O7
Mr(Cl2O7) = 2Ar(Cl) + 7Ar(O) = 2 * 35.5 + 7 * 16 = 71 + 112 = 183
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Cl2O7
Mr(Cl2O7) = 2Ar(Cl) + 7Ar(O) = 2 * 35.5 + 7 * 16 = 71 + 112 = 183