Chemistry, 01.09.2021 06:40, gl648809

Cho hợp chất XY₂ tạo bởi 2 nguyên tố X, Y,Z, có hai đồng vị: ⁷⁹Y chiếm 55% số nguyên tử Y và đồng vị ⁸¹Y. Trong XY₂ phần trăm khối lượng của X là bằng 28,51% Tính nguyên tử khối trung bình của X, Y

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Cho hợp chất XY₂ tạo bởi 2 nguyên tố X, Y,Z, có hai đồng vị: ⁷⁹Y chiếm 55% số nguyên tử Y và đồng vị...