2+1= 3 bạn à
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\(\dfrac{x}{3}-2=\dfrac{1}{15}\)
=>\(\dfrac{x}{3}=2+\dfrac{1}{15}=\dfrac{31}{15}\)
=>\(x=\dfrac{31}{15}\cdot3=\dfrac{31}{5}\)
Bài 2 :
a) \(n_{Al}=\dfrac{9,2}{27}=0,34\left(mol\right)\)
\(PTHH:2Na+2H_2O->2NaOH+H_2\)
0,17 0,17 0,17 0,17
\(V_{H_2}=0,17.22,4=3,808\left(l\right)\)
\(m_{NaOH}=0,17.40=6,8\left(g\right)\)
Chọn đáp án A
Cả 4 phản ứng (1), (2), (3), (6) đều có cùng phương trinh ion rút gọn là: Ba2+ + S O 4 2 - à BaSO4
(4) không cùng phương trình ion rút gọn vì có tạo khí SO2
(5) không cùng phương trình ion rút gọn vì có tạo khí NH3
\(1,4Na+O_2\rightarrow^{t^o}2Na_2O\\ 2,4P+5O_2\rightarrow^{t^o}2P_2O_5\\ 3,3Fe+2O_2\rightarrow^{t^o}Fe_3O_4\\ 4,2H_2+O_2\rightarrow^{t^o}2H_2O\\ 5,N_2+H_2⇌^{\left(t^o,xt,p\right)}NH_3\\ 6,P_2O_5+3H_2O\rightarrow2H_3PO_4\\ 7,N_2O_5+H_2O\rightarrow2HNO_3\\ 8,2Al+6HCl\rightarrow2AlCl_3+3H_2\\ 9,2Al+3H_2SO_4\rightarrow Al_2\left(SO_4\right)_3+3H_2\\ 10,2Cu+O_2\rightarrow^{t^o}2CuO\\ 11,CaO+2HNO_3\rightarrow Ca\left(NO_3\right)_2+H_2O\\ 12,Al\left(OH\right)_3+3HNO_3\rightarrow Al\left(NO_3\right)_3+3H_2O\\ 13,Zn+2HCl\rightarrow ZnCl_2+H_2\)
\(\frac{1}{3}+x\times\frac{2}{7}=\frac{11}{12}\)
\(x\times\frac{2}{7}=\frac{11}{12}-\frac{1}{3}\)
\(x\times\frac{2}{7}=\frac{7}{12}\)
\(x=\frac{7}{12}:\frac{2}{7}\)
\(x=\frac{49}{24}\)
~Moon~
\(\frac{1}{3}+x.\frac{2}{7}=\frac{11}{12}\)
\(x.\frac{2}{7}=\frac{11}{12}-\frac{1}{3}\)
\(x.\frac{2}{7}=\frac{7}{12}\)
\(x=\frac{7}{12}\div\frac{2}{7}\)
\(x=\frac{49}{24}\)
Chà, có 1 vài lỗi nhỏ ở đây
2 used to play
3 having good critics
4 left halfway through it ( chắc vậy ;-; )
6 used to wash
1. This/most boring/film/I/ever/watch/
This is the most boring film I have ever watched
2. We/feel/satisfy/ending/this/movie/.
We feel satisfied with the ending of this movie
3. I/ used / play / games / twice a week.
I used to playing games twice a week.
3. In spite/have/good critics/this film/make/me/disappoint/.
In spite of having critics,this film make me disappointed.
4. The movie/boring/so/we/left/halfway/it/
the movie was boring so we left halfway it.
5. Although/there/many/famous/actors/the movie/plot/uninteresting/
Although there are many the most famous actors,its plot is uninteresting.
6. I / use/ wash/ clothes/ hand/ the past.
I used to washed clothes by hand in the past.
7. We/ feel / satisfy/ ending/ this movie
We feel satisfied with the ending of this movie
8. I / go / see / film / feel / tired
I go to see the film despite feeling really tired.
9. He / live / country / he / child
He lived in the country when he was a child.
10.They found the journey to the USA very tiring.
(không biết)
2 + 1 = 3 Đ
chính xâc giỏi quá .
HT
nhớ k cho chị nha.
ok chị nhớ