Đáp án:
b. 48,6
c. 6,72l
Giải thích các bước giải:
a. 2Zn+O2->2ZnO
b. nZn=39/65=0,6
->nZnO=nZn=0,6
->mZnO=0,6.81=48,6
c. nO2=nZn/2=0,6/2=0,3
->VO2=0,3.22,4=6,72l
a) 2Zn + O2 ==nhiệt độ==> 2ZnO
b) nZn= 39/65= 0,6 (mol)
nZnO=nZn=0,6 (mol)
==> mZnO= 0,6.81= 48,6 (g)
c) nO2=1/2nZn=(1/2).0,6= 0,3 (mol)
==> VO2= 0,3.22,4= 6,72 (l)
III/ Read the passage. Then answer the questions Uncle Mike is a doctor and he works in a big hospital in London. He usually gets up at seven, has big breakfast at seven thirty and then drives to the hospital. He works from eight a.m to four thiry p.m. At noon, he has half an hour for lunch. After work, he often plays golf and has a drink with his colleagues. He drives home at six and has dinner at seven. After dinner, he often reads newspapers and watches TV. He always goes to bed at ten thirty. 1. What’s Uncle Mike’s job ? 2. What time does he get up? 3. How many hours a day does he work? 4. What does he often do after work?
Khi con tu hú gọi bầy Lúa chiêm đang chín, trái cây ngọt dần Vườn râm dậy tiếng ve ngân Bắp rây vàng hạt đầy sân nắng đào Trời xanh càng rộng càng cao Đôi con diều sáo lộn nhào từng không.... a. Xác định nghệ thuật đặc sắc của đoạn thơ trên và nêu tác dụng. b. Viết đoạn văn với độ dài từ 120 - 150 chữ cảm nhận của em về đoạn thơ trên. AI GIÚP EM ĐƯỢC KO Ạ!!!!!!!!!!!!!!
IV. WRITING 1. Find one mistake and correct it.(vì ko gạch chân đc nên mình đóng ngoặc nhé) 1.The student (fancy) (reading) books (on) travel and (tourism). A B C D 2.There (were) a (lot) (more) people (joining) the festival than I had thought at firstly. A B C D 3.I love the countryside life (although) it (was) (the) most colourful (part) of my childhood. A B C D 4.You (needn’t) watch TV (a lot) at night (because) it will make you feel (very tired) A B C D 5.When we (turned) 6 years, our parents (started) to( allow) us (going out) at night until 10 A B C D 2. Rewrite the following sentences based on the given words. 1. No one can fly kites better than Hung in my village. Hung flies kites______________________________________________________ 2. People living in cities have to drive more carefully than those living in the countryside. People living in the countryside don't have to drive so_______________________ 3. It is more difficult for people to find jobs in the countryside than in the cities. People find it _______________________________________________________ 4. I have never seen such a beautiful picture before. This is the most _____________________________________________________ 5. His house is the biggest one in the village. None of houses in the village __________________________________________ 6. People don’t care much about environment, so they keep making it worse. If people _____________________________________________________________ 7. The drainage system is damaged. There is not enough water for the crop. If the drainage system __________________________________________________ 3. Reoder the following words to make meaningful sentences. 1. When/game/ be careful/ you/ online/, /when/ make friends/ strangers/ you/ with //. ___________________________________________________________________ 2. We/ that/ can/ Kim/ likes/ see/ the/ piano/ playing //. ___________________________________________________________________ Such as/ hobbies/ or/ making/ things/ crafts/ collecting/ interesting/ are / some //. ___________________________________________________________________ 3. health/ sitting/ problems/ all/ day/ in front of/ the/ can/ computer/ cause //. ___________________________________________________________________ 4. fancy/ you/ do/ children/ with/ working? // ___________________________________________________________________ bạn nào giúp mk vs ạ ! Bài nào cx đc
Giải giúp vs ạ Giải nhanh giúp em vs ạ
So sánh sự khác nhau về hình dạng, diện tích giữa châu Phi và châu Mỹ?
Giúp mik vs ai nhanh mik vote cho nhé thanks
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