có một hỗn hợp gồm 60% Fe2O3 và 40% CuO về khối luợng.Người ta dùng H2 (dư) để khử 20g hỗn hợp đó. a)Tính khối lượng của Fe và Cu sau phản ứng b)Tính thể tích H2 đã tham gia phản ứng

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IV. Combine each pair of sentences using a relative pronoun or relative adverb. 1. She is the most intelligent woman. I’ve ever met this woman. .......................................................................................................................................... 2. This doctor is famous. You visited him yesterday. .......................................................................................................................................... 3. These children are orphans. She is taking care of these children. .......................................................................................................................................... 4. The two young men are not good persons. You are acquainted with them. .......................................................................................................................................... 5. My father goes swimming every day. You met him this morning. .......................................................................................................................................... 6. I thanked the woman. This woman had helped me. .......................................................................................................................................... 7. The man is my father. I respect his opinion most. .......................................................................................................................................... 8. Mary and Margaret are twins. You met them yesterday. .......................................................................................................................................... 9. I’ll introduce you to the man. His support is necessary for your project. .......................................................................................................................................... 10. The middle-aged man is the director. My father is talking to him. ..........................................................................................................................................