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24 tháng 10 2021

a) Cho hỗn hợp bột kim loại tác dụng với HCl dư (hoặc H2SO4 loãng dư), thì chỉ có bột sắt Fe tác dụng theo phương trình: Fe + 2HCl ----> FeCl2 + H2. 
bẹn tham khảo

24 tháng 10 2021

chịu mặt dù đã tự tay tìm hiểu vì nghịch ăn trộm điếu thuốc

24 tháng 10 2021

ai mak bt đcundefined

24 tháng 10 2021

D.40 nhé bạn 

19 tháng 1 2022

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19 tháng 1 2022

gggggggggggggggggggggggggggggggggggggggggggnv

11 tháng 1 2022

a/ \(200ml=0,2l\)

\(\rightarrow n_{H_2SO_4}=1,25.0,2=0,25mol\)

PTHH: \(MgO+H_2SO_4\rightarrow MgSO_4+H_2O\)

\(2Al+3H_2SO_4\rightarrow Al_2\left(SO_4\right)_3+3H_2O\)

\(\rightarrow\hept{\begin{cases}40.n_{MgO}+102.n_{Al_2O_3}=11,8\\n_{MgO}+1,5.n_{Al_2O_3}=0,25\end{cases}}\)

\(\rightarrow\hept{\begin{cases}n_{MgO}\approx0,19mol\\n_{Al_2O_3}\approx0,04mol\end{cases}}\)

\(\rightarrow\%m_{MgO}=\frac{0,19.40}{11,8}.100\%\approx64,41\%\)

\(\rightarrow\%m_{Al_2O_3}=100\%-64,41\%=35,59\%\)

b. \(n_{MgSO_4}=n_{MgO}=x=0,19mol\) và \(n_{Al_2\left(SO_4\right)_3}=0,5.y=0,02mol\)

\(\rightarrow C_{M_{MgSO_4}}=\frac{0,19}{0,2}=0,95M\)

\(\rightarrow C_{M_{Al_2\left(SO_4\right)_3}}=\frac{0,02}{0,2}=0,1M\)

Hi, my name is Tina. I have twin brothers, Tim and Tom. They are very similar and many people don’t know which twin is which. They both (1)………… blond hair and blue eyes, and they always (2)………….jeans and T-shirts. They like wearing the same things, and they like doing the same things, too. For example, they both like pop music and they are crazy about football and computers. They go (3)……to…….. a football match every Saturday. They’d like to play computer games every...
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Hi, my name is Tina. I have twin brothers, Tim and Tom. They are very similar and many people don’t know which twin is which. They both (1)………… blond hair and blue eyes, and they always (2)………….jeans and T-shirts. They like wearing the same things, and they like doing the same things, too. For example, they both like pop music and they are crazy about football and computers. They go (3)……to…….. a football match every Saturday. They’d like to play computer games every night, but our mother says they can’t (4)……………….they have a lot of homework. Although they are twins, they aren’t the same in every way. Tim is (5)............................. He works hard at school, but Tom doesn’t. He’s a bit (6)……………….....Tim is reliable and always does what he says he will while Tom is a little (7).........................and sometimes forgets his words.

 

1

1. have
2. wear
3. to
4. play
5. smart
6. 
.shy
7. shy
          CÓ SAI SÓT GÌ BỎ QUA NHÉ! CHÚC BẠN HỌC TỐT
 

23 tháng 10 2021

TL :

Chọn C nha

HT

23 tháng 10 2021

TL:

C
HT