user-avatar
tranvanthoai
2 năm trước
Cho m gam hỗn hợp X gồm Fe, Fe3O4 và FeCO3 (tỉ lệ mol tương ứng là 6 : 1 : 2) phản ứng hoàn toàn với dung dịch H2SO4 (đặc, nóng) thu được dung dịch Y chứa hai muối và 2,128 lít (đktc) hỗn hợp khí Z gồm CO2 và SO2. Biết Y phản ứng tối đa với 0,2m gam Cu. Hấp thụ toàn bộ Z vào dung dịch Ca(OH)2 dư, thu được a gam kết tủa. Giá trị của a là:
Thích Trả lời Chia sẻ

Các câu hỏi liên quan

Hơi khó nhìn. Mấy b cố đọc nha 3. Read the TV programmes. Decide if the statements are true (T) or false (F). Circle Tor F. CHANNEL 1 CHANNEL 2 6.00 The news and weather. 6.30 South-East today. Local news. 7.00 Film. Dr Doolittle. Funny story, 8.10 Music Box. An hour of pop music. 10.00 News and weather. 10.15 On catwalk. Fashion magazine. 11.00 Kwaidan. A Japanese fairy-tale. 12.00 ATP World Tour. Tennis from Wimbledon. 6.00 Tom and Jerry. Cat and mouse fun. 6.15 Animal World. All about dolphins. 7.00 Premier League. Football news. 8.00 Friends. Situational comedy. 9.10 News and weather. 9.30 Frankenstein. A scary film for adults. 11.10 Top 10. Music chart. Great rock! 12.00 News Headlines. 1. You can watch the news twice on Channel 1. T. F 2. The animal programme starts at 6 o'clock. T. F 3. The fashion magazine lasts for 45 minutes. T. F 4. Music box offers rock music. T. F 5. Frankenstein is not for children. T. F

A. PHONETICS I. Circle the word whose underlined part is pronounced differently from that of the other words. 1) A. supply B. dirty C. energy D. happy 2) A. decreased B. influenced C. endangered D. established 3) A. answer B. sweater C. swim D. switch II. Circle the word that has stress pattern different from that of the other words. 4) A. nature B. danger C. human D. environment 5) A. exist B. species C. effect D. condition 6) A. forest B. water C. destroy D. industry B. VOCABULARY AND GRAMMAR * Circle the best answer for each sentence. 7) Many rare ____ o animals are in danger of extinction. A. species B. classes C. beings D. pairs 8) People are destroying the environment by adding ____ to it. A. pollutes B. pollutions C. pollutives D. pollutants 9) Many efforts have been made to protect ____ nature. A. danger B. dangerous C. endanger D. endangered 10) Many species of animals are threatened and could easily become ____. A. disappeared B. vanished C. empty D. extinct 11) Many animals are ____ for their fur and other valuable parts of their bodies. A. hunted B. chased C. run after D. followed 12) They started a campaign to ____ smoking among teenagers. A. encourage B. decrease C. discourage D. prohibit 13) Dinosaurs became ____ millions of years go. A. disappear B. extinct C. lost D. endangered 14) The chemical ____ from cars and factories make the air, water and soil dangerously dirty. A. pollution B. polluted C. pollutants D. pollute 15) Human beings are ____ for the changes in the environment. A. account B. faulty C. blame D. responsible 16) By cutting down trees, we ____ the natural habitat of birds and animals. A. hurt B. would C. damage D. injure 17) ____ aren’t effective anymore because insects have become resistant to them. A. Fertilizer B. Pesticides C. Herbicides D. Composts 18) They started a campaign to ____ smoking among teenagers. A. encourage B. decrease C. discourage D. prohibit 19) He is the singer about ____ I often tell you. A. that B. who C. whom D. him 20) The concert ____ I listened last weekend was boring. A. to that B. to which C. for what D. for which

2018 © Loga - Không Ngừng Sáng Tạo - Bùng Cháy Đam Mê
Loga Team