Cho khí H2 đi qua bột Sắt (III) oxit nung nóng người ta thu được sắt theo sơ đồ PƯ sau: Fe2O3 + H2 ---> Fe + H2O a) Nếu sau phản ứng thu được 79 g Fe thì khối lượng Fe2O3 đã tham gia PƯ là bao nhiêu gam? b) Khối lượng hơi nước được tạo thành trong PƯ trên là bao nhiêu gam? c) Tính thể tích khí H2 cần dùng để khử oxit sắt trên ở đktc?

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Exercise 7. Read the passage and answer the following sentences. On Wednesday evening, we went to the Town Hall. It was the last day of the year and a large crowd of people had gathered under the Town Hall clock. It would strike twelve in twenty minutes' time. Fifteen minutes passed and then, at five to twelve, the clock stopped. The big minute hand did not move. We waited and waited, but nothing happened. Suddenly, someone shouted “It's two minutes past twelve! The clock has stopped!” I looked at my watch. It was true. The big clock refused to welcome the New Year. At that moment, everybody began to laugh and sing. Notes: - strike (v): đánh, đập, điểm - minute hand (n): cây kim phút - suddenly (adv): đột nhiên - refuse (v): từ chối * Questions: 1. Where did they go on Wednesday evening? ………………………………………………………………………………………………… 2. Was it the first day of the year? ………………………………………………………………………………………………… 3. What time did the clock stop? ………………………………………………………………………………………………… 4. Did the big minute hand move? ………………………………………………………………………………………………… 5. What did everyone begin to do at that moment? …………………………………………………………………………………………………