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Ngocanhanh
2 năm trước
hợp chất X tạo thành từ 3 nguyên tố là H, O và một nguyên tố Z chưa biết. trong đó , chỉ số nguyên tử X gấp hai lần chỉ số của nguyên tử Z, phần trăm khối lượng của Z là 34,83%. Phân tử khối của X là 98 đvC. Tìm CTHH của chất X
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