Hãy nhập câu hỏi của bạn vào đây, nếu là tài khoản VIP, bạn sẽ được ưu tiên trả lời.
\(Z=17\)
Chất này nằm tại ô 17 trong "Bảng tuần hoàn Hoá Học"
Vậy là Al
\(Z=13\)
Chất này nằm tại ô 13 trong "Bảng tuần hoàn Hoá Học"
Vậy là Cl
Có Al hoá trị III và Cl hoá trị I
Đặt CTHH là \(Al_xCl_y\)
Theo quy tắc hoá trị \(x.III=y.I\)
\(\rightarrow x=1;y=3\)
Vậy CTHH là \(AlCl_3\)
My name is linh dan.I'm from Viet Nam.I'm Vietnamese.I'm nine years old
NaOH + HCl --> NaCl+H2O (1)
2NaOH +H2SO4 --> Na2SO4 +2H2O (2)
Đặt nNaOH (1)= a(mol)
nNaOH(2) = b (mol)
=>a + b = 0,3.2 =0,6( *)
Theo PT (1) : nNaCl = nNaOH(1) = a(mol)
Theo PT (2) : nNa2SO4=12
nNaOH(2) = 0,5b(mol)
=>58,5a + 71b =40,1(**)
Từ (*), (**) => a= 0,2 ; b = 0,4
nHCl = nNaOH (1)=0,2 mol
=> x=CMHCl=0,20,2=1M
nH2SO4 = nNaOH (2)=0,4 mol
y=CMH2SO4=0,40,2=2M
1. I'm leaving now because I don't want to miss the train. (so)
→ I'm ___LEAVING NOW SO THAT I WON'T MISS THE TRAIN_________
2. The last time I saw my uncle was two years ago. (for)
→ I haven’t___SEEN MY UNCLE FOR TWO YEARS___
3. Let me reach my office and then I will talk to him. (when)
→ I ____WILL TALK TO HIM WHEN I REACH MY OFFICE______
4. Why don't we donate our old books, toys and clothes to charity? (suggests)
→ Mom ______SUGGESTS DONATING OUR OLD BOOKS, TOYS AND CLOTHES TO CHARITY_______
5. Jane stayed behind after the class in order to talk to the teacher. (because)
→ Jane ___STAYED BEHIND AFTER THE CLASS BECAUSE HE WANTED TO TALK TO THE TEACHER_____
6. This is the first time they’ve been to Korea. (before)
→ They’ve _____NOT BEEN TO KOREA BEFORE ______
7. How long have you been a member of Volunteers In Asia? (join)
→ When___did you join Volunteers In Asia ?_____
1.I am staying at home so I do not want to miss the train
2.I have not seen my uncle for years
3.I will talk to him when I reach my office
4.Mom suggested donating our old book,toys and clothes to charity
5.Jane stayed behind afterthe class because she wanted to talk to the teacher
Hóa trị của lưu huỳnh S trong H2S và SO2 lần lượt là 2 và 4