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taituhollywood
Zambia
24 Posts
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 Posted - 21/02/2003 : 20:23:50    
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cho mot kim loai chua biet hoa tri tac dung voi 200ml NaoH 0,5M , biet rang kim loai khoi luong kim loai do dung la 200g . Hay xac dinh ten kim loai do va viet phuong trinh .
taitu |
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datacnhang1
Vietnam
14 Posts
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Posted - 24/02/2003 : 14:32:59
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BAI NAY QUA MO HO DO
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shang
Vietnam
26 Posts
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Posted - 27/02/2003 : 10:31:25 
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lam` on cho tui them du~ kien di neu' ko thi` chac chi? co' mo` ra thoi ko lap luan chac chan duoc dau.
THIEU GIA HO NGUYEN TEN HAI |
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hocsinhguongmau
Posts
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Posted - 08/03/2003 : 19:30:48
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cai nao du
du bao nhieu
tac dung vua du ?
muoi sau p/u nang 200 g?
chang hieu gi ca
viet the thi nguyen ba ngoc cung cha lam duoc
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prince18th
Vietnam
221 Posts
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Posted - 09/03/2003 : 08:08:04 
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t�n t�i tử đ�u rồi ?
__________________
But... I can't help falling in love with you.... |
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BKA
5 Posts
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Posted - 09/03/2003 : 10:11:51
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bai nay du du kien roi do cac ban cu lam di neu ko duoc 2 ngay nua minh dua dap an
cho cac ban 2 ngay
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tuananh_dng
Posts
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Posted - 11/03/2003 : 10:48:16
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| hiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiii |
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shang
Vietnam
26 Posts
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Posted - 18/03/2003 : 21:15:33
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bac BKA sao mai~ ko thay pos bai` len vay tui cho` lau we' rui` hic hic ...........hic Neu' bac ko lam` duoc thi` dung` noi' nhu vay chu' ..........===> buon` lem'
THIEU GIA HO NGUYEN TEN HAI |
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taituhollywood
Zambia
24 Posts
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Posted - 19/03/2003 : 20:04:04
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bac bka noi dung do . day du du llieu roi ma , cac ban gang lam di co thuong hehehhehehehe
taitu |
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salem85
27 Posts
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Posted - 19/03/2003 : 21:36:14
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Goi kim loai do la A, hoa tri n, ta co phuong trinh :
A + (4- n)OH- + (n-2)H2O = AO2(4-n)- + n/2H2
So mol OH- = 0,1 mol => so mol A = 0,1/(4-n) => khoi luong mol A = 2000. (4-n). Thay n = 1,2,3 vao bieu thuc => khong co nghiem thoa. Bai nay co sai de khong vay?
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salem85
27 Posts
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Posted - 05/04/2003 : 22:51:13
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� t�i tử, b�a của tui đ�ng hay sai g� cũng phải n�i cho người ta biết với chứ
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xine-danlinh
Vietnam
22 Posts
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Posted - 06/04/2003 : 08:52:38
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nay taitu chi tuong tuong hoi phong phu day !
1112 |
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phongluu
Vietnam
4 Posts
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Posted - 06/04/2003 : 16:17:53
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tai tu bai cua ong thieu du kien lam sao ma giai duoc
huy |
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day co bai moi day !