- M2CO 3+ 2HC1> MCI 2+ CÔt + H2O (2)
Giai he phuong trinh (I) va (II) dugc: x= y= 0,03mol.
7.27. Dapan diing laC 7.28 Dap an diing la B.
Cac phirong trlnh phan ling :
2KMn04 — ^ K2Mn04 + M n 0 2 + O2
NaNOj — ^ N a N 0 2 +
7.29. Dap an diing la D.
Cac phuong trlnh phan ling:
NaX + AgNO, ^ AgX + NaNO, (1) NaY + AgNO, ^ AgY + NaNO, (2) - Xet trudng hop AgX va AgY deu la chat ket tiiạ Khi do s6' mol hai
muoi la:
n=MlzMl.0,03 (mol)
108-23
^ M m u 6 - i = - ^ - = 2 0 1 .
0,03
Khd'i litgng mol cua X va Y nam trong khoang:
X < 2 0 1 - 2 3 = 178 < Y
lot la halogen c6 khÓi lugng mol nguyfin tir Idn nhát la: I = 127. Do do, khdng c6 halogen Y > 178: loai trudng hop naỵ
- Xet trucnig hop c6 mot muoi bac kh6ng ket tiiạ Do la AgF. Muoi A g Y la A g C l i . " A ^ C I = 0,06 mol = n^.d mN„a = 58,5.0,06 = 3,51 (gam). n i N a F = 6,03 - 3,51 = 2,52 (gam): % m N , p = . 100% = 41,8%. 6,03 7.30. Dap an diing la A .
Ba thi nghiem xay ra phan ling hoa hoc la (I), (II) va (III).
7.31. Dap an diing la Ạ
Phuong trlnh ion nit gon chung la : Bâ^ + SÔ^ ^ BaS044
7.32. Dap an diing la C.
So mol cac chát :
3.024 0,9408 ^ ,
T .iheo de bai : d^ ^•'u-- A 14x + 16y Q y,^ = ^ — - = 22 .
-> 14x + 16y = 44.
Cap nghidm duy nhát phii hop la: x = 2, y = 1. Vay CTPT cua khi N,Oy la: NjỌ
nN,o = 0'042 mol njj = 0,082 mol.
+5 +1
Khi phan ling: N + 4e -> N
+5
-> S6' mol electron N thu la : 4.0,084 = 0,336 (mol)
0 +x
M - x.e -> M
" 3 024
S6 mol electron M cho la: x.-^ = 0,336 (mol).
M 3,024
-> M = x. 0,336
Cap nghiem duy nhát phu hop: x = 3, M = 27. vay kirn loai M la A l (nhom).