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Hợp chất Z có công thức MaXb trong đó M chiếm 79,75% về khối lượng. Trong hạt nhân M có số nơtron nhiều hơn số proton là 5 hạt . Trong hạt nhân X số nơtron bằng số proton. Tổng số proton trong phân tử Z là 74 . a/ Xác định công thức phân tử của hợp chất Z , biết X là một phi kim thuộc chu kỳ 3 của bảng tuần hoàn . b/ M có 2 đồng vị , đồng vị thứ II có nhiều hơn đồng vị thứ I ( có trong Z ) hai hạt nơtron. Trong hợp chất Z’ (MaXb) số lượng đồng vị II bằng 37% số lượng đồng vị I .Tính thành phần % theo khối lượng của đồng vị I trong hợp chất Z’
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