hòa tan hoàn toàn m gam Fe vào 400ml dung dịch HCl 1M sau phản ứng thu được 3,36 lít khí H2 ở đktc và dung dịch X. (cho Fe = 56 và thể tích dung dịch coi như không đổi). Tính nồng độ các chất trong dung dịch X

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Exercise 3: Viết lại các câu sau sao cho nghĩa không đổi. 1. Her old house is bigger than her new one. -> Her new house……………………………………......... 2. No one in my class is taller than Peter. -> Peter ………………………………………………. 3. The black dress is more expensive than the white one. -> The white dress …………………………………………… 4. According to me, English is easier than Maths. -> According to me, Maths …………………………………. 5. No one in my group is more intelligent than Mary. -> Mary ………………………………………………………. Exercise 4: Hoàn thành câu sau đúng dạng thì qúa khứ đơn: 1. It/ be/ cloudy/ yesterday. ____________________________________________________________________ 2. In 1990/ we/ move/ to another city. ____________________________________________________________________ 3. When/ you/ get/ the first gift? ____________________________________________________________________ 4. She/ not/ go/ to the church/ five days ago. ____________________________________________________________________ 5. How/ be/ he/ yesterday? ____________________________________________________________________ 6. Mr and Mrs. James/ come back home/ and/ have/ lunch/ late/ last night? ____________________________________________________________________ 7. They/ happy/ last holiday? ____________________________________________________________________ 8. How/ you/ get there? ____________________________________________________________________ 9. I/ play/ football/ last/ Sunday. ____________________________________________________________________ 10. My/ mother/ make/ two/ cake/ four/ day/ ago. ___________________________________________________________________