Em tham khảo nhé!
Số oxi hóa hầu hết của Al trong hợp chất là: +3 (do Al là kim loại thuộc nhóm IIIA)
Như vậy số oxi hóa của C: -4
Trong hợp chất, $Al$ có số oxi hoá $+3$
Đặt số oxi hoá $C$ trong $Al_4C_3$ là $x$
$\to 4.(+3)+3x=0$
$\to x=-4$
Vậy ta có: $\mathop{Al_4}\limits^{+3}\mathop{C_3}\limits^{-4}$
Tứ giác ABCD có chu vi 66cm. Tính độ dài AB biết chu vi tam giác ABC = 56cm; chu vi tam giác ACD = 60cm
Mik đang cần gấp mong các bạn giúp mik
Em hãy viết đoạn văn khoảng 200 chữ chữ kể về đức tính có công mài sắt có ngày nên kim
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