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hanhhanh.2000
2 năm trước
Câu 1. (3,5 điểm) Đạm ure có công thức hoá học là CO(NH2)2, dùng làm phân bón hoá học cung cấp nitơ cho đất. Tính số kg ure cần mua để có 84 kg nitơ. Câu 2. (3,5 điểm) Cho phương trình hoá học: Fe + 02 Fe304. Tính số gam Fe đã hoá hợp hoàn toàn với 0,448 lít khí Oxi ở đktc.
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