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1 tháng 12 2022
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47. Peter who can solve this diffcult problem is the best student
48. My secretary is a fast typer
30 tháng 3 2022
a) \(n_{H_2}=\dfrac{0,56}{22,4}=0,025\left(mol\right)\)
\(n_{Cl_2}=\dfrac{1,4}{22,4}=0,0625\left(mol\right)\)
PTHH: Fe + 2HCl --> FeCl2 + H2
0,025<------0,025<--0,025
2Fe + 3Cl2 --to--> 2FeCl3
0,025-->0,0375
Cu + Cl2 --to--> CuCl2
0,025<-0,025
=> \(\left\{{}\begin{matrix}\%m_{Fe}=\dfrac{0,025.56}{0,025.56+0,025.64}.100\%=46,67\%\\\%m_{Cu}=\dfrac{0,025.64}{0,025.56+0,025.64}.100\%=53,33\%\end{matrix}\right.\)
\(\%n_{Fe}=\%n_{Cu}=\dfrac{0,025}{0,025+0,025}.100\%=50\%\)
b) X chỉ chứa FeCl2
=> %mFeCl2 = 100%
19 tháng 3 2022
\(I=100mA=0,1A\)
\(l=200cm=2m\)
Lực từ tác dụng lên dây dẫn:
\(F=B\cdot I\cdot l\cdot sin\alpha\)
\(\Rightarrow F=4\cdot10^{-2}\cdot0,1\cdot2=8\cdot10^{-3}N\)
DT
Đỗ Thanh Hải
CTVVIP
1 tháng 8 2021
43 He asked Nga if she lived with her family
44 He asked if my uncle lived in England
45 Mary asked Peter if he would come to her party the day after
46 Mai asked Quang if he phoned her everyweek
47 She asked David if that was his bag
48 She asked me if I had to come back before 10
49 She asked if I was listening to music
50 Mary asked Peter if he wanted her to help him
51 She asked me what it was
52 I asked him if he was from Australia
53 I asked Mr Hoang if he would go to Hue on holiday the next month
54 Mary asked Peter if his sister had a book store in Hue
55 Mr Brown asked if he had to go then
56 Hoa asked me what I was doing then
57 She asked me if I could work on Sundays
58 Nga asked her brother if he was in his room then
59 She asked Tom why he was late that day
60 He asked Linda if he could borrow her pen
61 Hung asked Nga if she met his teacher
52 She asked if my father work there
KY
29 tháng 8 2021
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David Cameron, who is the prime minister, has resigned after uk voted to leave the european union
Emily Bronte, who is best known for her only novel"Wuthering heights", was an E novelist and poet
Jane Austen whose most highly praised...., was an E novelist
Melbourne where my uncle lives is very beautiful
