[Trang Ánh Nam] New comment on Công thức giải nhanh hóa học.

Nam Trang Ánh has left a new comment on your post "Công thức giải nhanh hóa học":

Câu 4: Hỗn hợp A gồm 3 chất Fe,FeO, Fe2O3 có khối lượng là 4,744 g. Chia hỗn hợp A thành 2 phần bằng nhau:
- Phần thứ nhất đem nung ngoài không khí đến khối lượng không đổi thì thấy khối lượng tăng them 0,56 g.
- Phần thứ hai đem hoàn tan vào dung dịch H2SO4 đặt đung nóng thì thu được V lít khí SO2 (đktc), giá trị của V là:
a. 0,784 lít b. 0,672 lít c.1,12 lít d. 1,11384 lít


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Posted by Nam Trang Ánh to Trang Ánh Nam at January 6, 2019 at 10:16 AM

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