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loga1008
2 năm trước
hợp chất Y tạo bởi 3 nguyên tố trong đó nguyên tố C chiếm 40% về khối lượng , nguyên tố H chiếm 6,67% về khối lượng và mỗi phân tử Y có 2 nguyên tử oxi . Xác địnhc ông thức hóa học của Y
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