Đáp án:
`Zn` + `2``HCl` → `ZnCl_2` + `H_2`
`n_(Zn)` = `(65)/(65)` = `0,1` `mol`
`n_{H_2}` = `(0,1 × 1)/1` = `0,1` `mol`
`V_{H_2}` = `0,1` × `22,4` = `2,24` `l`
`n_{ZnCl_2}` = `(0,1 × 1)/1` = `0,1` `mol`
`m_{ZnCl_2}` = `0,1` × `136` = `13,6` `gam`
Giải thích các bước giải:
$n_{Zn}$ = $\frac{6,5}{65}$ = $0,1$ (mol)
PTHH: $Zn + 2HCl → ZnCl_{2} + H_{2}↑$mol: 0,1 → 0,1 → 0,1
$V_{H_{2}} = 0,1.22,4 = 2,24 (l)$
$m_{ZnCl_{2}} = 0,1.136 = 13,6 (g)$
IV. Complete these sentences: 1. I ._ike ele_hants. What ab_ut you? I like m_nkey_. 2. I us_ally have br_ _kfast a_ 7.00 o’clo_k. 3. Let’s g_ to the superm_rket. That is a go_d idea. 4. How much is this blue sh_rt? It is 57,000 d_ngs. 5. She likes that bl_e jeans but I lik_ this re_ one. 6. What c_l _ _r is your pen? - It’s pi_ k. 7. How mu_ _ are the book_? They a_e 100 dongs. 8. Alan likes ti_ _rs. 9. My f_ther like_ watc_ing TV i_ his fre_ time. 10. Where _o you wan_ to g_ now?
lan is very busy ,so she can't take part in our project If lan..... Xuân is a humorous boy .his sense of humor car distinguish him from others Xuân...
II. Write a complete letter, using the cues given. Dear Lan, 1. Last weekend/ our class/ visit London. => .................... 2. We / get up early/ take a bus. => .................... 3. Firstly, We/go /see Big Ben/ House of Parliament. => .................... 4. Then go down/ River Thames/ to/ Tower of London . => .................... 5. take /a lot / photos/ under “ London Eye”. => .................... 6. meet / lot of foreigners/ they/ friendly. => .................... 7. have fish and chips/ for lunch. => .................... 8. In/ afternoon / we/ the book shop . => .................... 9. I/ buy a dictionary/ some stamps. => .................... 10. feel tired / but happy/ after the visit. => .................... Yours, Trang.
Cảm nhận những hoài niệm về tuổi thơ trong bài thơ bếp lửa của Bằng Việt (bài thơ nghị luận xã hội)
Tìm `a,b\inN`biết `a+b=20` `a/2=b/8`
tập làm van miêu tả mùa dịch covid đợt bùng phát thứ tư
III. Match the sentence in the column A with each sentence in the column B: A B 1. What colour is it? a. It’s 100.000 dong. 2. Why do you want to go the post office? b. I like beef and fish. 3. Would you like some hamburger? c. It’s green. 4. How much is the dress? d. It’s 6.00 o’clock. 5. I like chicken. What about you? e. Her name is Linda Young. 6. What time is it? f. Because I want some stamps. 7. What’s your teacher’s name? g. Yes, please. 8. How many students are there in your school? h. There are over four hundred.
đủ nhanh giúp mk vs ạ Làm nhanh mk cho 5 *****lun
`(a_1 + a_2 + a_3 +...+ a_{n-1} + a_n)^2=?`
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