user-avatar
longvu0000000000
2 năm trước
Câu 35:Hỗn hợp X gồm Fe,FeO,Fe304 và Fe2O3.Đem hào tan 14.4 gam hỗn hợp X trong lượng dư dung dịch H2S04 đậm đặc,nóng,có 6,72l khí SO2 duy nhất thoát ra(ĐKTC).Sau khi kết thúc phản ứng,đem cô cạn dd,thu đc m gam muối khan.Trị số của m là!!?
Thích Trả lời Chia sẻ

Các câu hỏi liên quan

It (not / rain) ______________ at all in Manchester last week. * 3 điểm A. didn't rain B. isn't C. hasn't rained D. doesn't rain It (rain) ______________ almost every day in Manchester. * 3 điểm A. rains B. rained C. has rained D. rain At 10 o’clock tomorrow, she will be in her office. She_________________ (work). * 3 điểm A. will work B. have worked C.will be worked D. will be working Nam and Vinh______________ (play) football yesterday. * 3 điểm A. are playing B. have played C.play D. played My son _______________ (not practice) the piano every day. * 3 điểm A. don't practice B. doesn't practice C.didn't practice D. hasn't practiced My mother often (teach) ______________ me English on Saturday evenings. * 3 điểm A. teaches B. has taught C. taught D. teach He (live) __________________in Australia for 10 years. * 3 điểm A. have lived B. lives C. has lived D. will live She usually _______________ (wash) the dishes after dinner. * 3 điểm A. washes B. washed C.wash D. is washing I often ______________ (drink) coca cola when I was a child. * 3 điểm A. am drinking B. drink C.drank D. has drunk Mr and Mrs Grey ___________________ (teach) French here for over five years. * 3 điểm A. teach B. have taught C.has taught D. taught My father (not, drink) _____________ coffee in the morning. * 3 điểm A. didn't drink B. isn't drinking C. hasn't drunk D. doesn't drink The last time I (go) ___________________ to HN was in May * 3 điểm A. was going B. have gone C.went D. go Please don’t make so much noise. I________________ (work). * 3 điểm A. worked B. work C. am working D. works Listen ! He (read) ________________ a story by Shakespeare. * 3 điểm A. is reading B. reads C.read D. has read Tony (not have) ________________ a bath at the moment. * 3 điểm A. won't have B. aren't having C. isn't having D. don't have Kate (not know) ____________ about the exam and she did very badly. * 3 điểm A. don't know B. didn't know C. hasn't known D. isn't known I ___________________ (know) Helen since we were at school together. * 3 điểm A. knew B. have know C.has known D. have known Susan and her friends ____________ (come) to Japan three months ago. * 3 điểm A. will come B. come C. came D. will be coming My parents (not take) ____________ to Vung Tau last week. * 3 điểm A. don't take B. didn't take C. haven't taken D. aren't taking At present Richard (study) ________________ in London. * 3 điểm A. was studying B. have studied C.studied D. is studying My mother _________________(bake) a cake in the kitchen at the moment. * 3 điểm A. bake B. is baking C. is baked D. bakes The children ________________ (not be) at home last Sunday. * 3 điểm A. aren't B. isn't C. haven't been D. weren't Simon usually ______________ (do) his homework and ______________ (watch) TV at the same * 3 điểm A. do / watch B. does / watches C. do / watches D. did / watched This time tomorrow, I_________________ (travel) through France. * 3 điểm A. will travel B. have travelled C.will be travelling D. travelled Nam and Vinh______________ (play) volleyball three times a week. * 3 điểm A. plays B. play C. are playing D. played We (spend) ___________________ our summer vacation in Ha Long Bay last July. * 3 điểm A. spent B. spend C. have spent D. are spending I ______________ (be) a student and my parents ______________ (be) teachers. * 3 điểm A. am / are B. am / is C. is / is D. be / are John (read) ___________________ the letter from Mary already. * 3 điểm A. have read B. has read C. read D. is reading At the same time tomorrow we _________________ (walk) through the streets of London. * 3 điểm A. will walk B. walks C. walk D. will be walking They (not see) ___________________ the film Titanic yet. * 3 điểm A. aren't seeing B. haven't seen C.don't see D. hasn't seen He_________________ (help) her take care of her children tomorrow morning. * 3 điểm A. helped B. helps C. has helped D. will help What _________________ (you/ do) at this time in five years? * 3 điểm A. will / do B. do /do C. will / be done D. will / be doing I (have ) ___________________ this toy since my birthday. * 3 điểm A. had B. have had C.has had D. is having

Exercise 18 a : Complete the sentences below with the verbs given in present perfect 1. He (be)…………. at his computer for seven hours. 2. She (not/have) ……………any fun for a long time. 3. My father (not/ play)……….. any sport since last year. 4. I’d better have a shower. I (not/have)………. one since Thursday. 5. I don’t live with my family now and we (not/see)…………. each other for five years. 6. I…… just (realize)…………... that there are only four weeks to the end of term. 7. She (finish) ... reading two books this week. 8. How long…….. (you/know)………. each other? 9. ……….(You/ take)………… many photographs? 10. ….he (eat)………………. at the King Power Hotel yet? 11. They (live) ………….here all their life.. 12. How many bottles………… the milkman (leave) ………….? He (leave) ……….. six. 13. I (buy)…………. a new carpet. Come and look at it. 14. She (write)………….. three books about her wild life. 15. We (finish) ……………………one English course.

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