A metal, M, forms an oxide next to the formula M2O surrounded by which the mass percentage of the metal is 94.32%. The chem?

A metal, M, forms an oxide with the formula M2O in which the mass percentage of the metal is 94.32%. The chemical symbol for the factor, M, is
"> % mass of O = 100-94.32= 5.68%
No. of Mol of O = 5.68/16 = 0.355 mol
No. of mol of M = 0.355 x 2 = 0.71 mol
Atomic Mass of M = 94.32/0.71 = 133 (3.s.f.)

Cesium has an atomic mass of 133, and can logically form a M2O compound with O as it is contained by Group I. Therefore, M has chemical symbol Cs for cesium.

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