Answer:
The atomic weight Ar, of M is 64
Explanation:
The formula of the given compound is M(OH)₂
Mr, is the molecular weight of a compound and for the given compound, Mr is equal to 98.
Ar, is the atomic weight of the elements in the compound
The molecular weight, Mrof a compound is the mass of one mole mole of that compound. It can be obtained by summing the atomic masses of all elements in that compound. For elements that has more than one atom in the compound, the atomic weight of that element is multiplied by the number of atoms of the element present in the compound and then the sum of the weight of each element gives the molecular weight of the compound.
Onnthe compound above,the atomic weight of the unknown element M, is to be obtained.
Ar of the other elements inn he compound is given : Ar of O = 16, Ar of H = 1.
Molecular weight of the compound, Mr = 98
Calculating for the Ar of M:
(M × 1) + (16 × 2) + (1 × 2) = 98
M +32 + 2 = 98
M + 34 = 98
M = 98 -34
M = 64
Therefore, the atomic weight Ar, of M is 64
