6.56. Dap an dung la Ạ
Cac phuong trinh phan \}ng :
Al + 3AgN03 -> A1(N03)3 3Agi (1)
2Al + 3Cu(N03)2 ^ 2A1(N03)3 + 3Cui (2)
Fe + 2AgN03 ^ Fe(N03)2 + 2Agi (3)
Fe + Cu(N03)2 ^ Fe(N03)2 + Cui (4)
Chat ran B g6m Ag, Cu va Fe du, vi Al hoat d6ng hon Fe n6n Al da phan ting h6't, sau do Fe phan ting va con dir.
Ket luan tren diing, vi trong B con Fe thi B tac dung vdi axit HCl cho
H2 bay l£n : Fe + 2HC1 ^ FeCl2 + H2 t .
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6.57. Dap s6'dung la C. ; Phuong trinh phan ling : 2Al + 3CuS04 Al2(S04)3 + 3Cụ Phuong trinh phan ling : 2Al + 3CuS04 Al2(S04)3 + 3Cụ
Goi s6' mol Al phan ling la x -> s6' mol Cu thoat ra la l,5x. Vi Al tan vao dung dich, Cu thoat ra bam vao thanh nh6m nen :
64.1,5x-27x = 51,38 - 50= 1,38 ^ x = 0,02. Khdi luong Cu thoat ra la : mQ, = 64.1,5.0,02 =^1,92 gam.
6.58. Dap an diing la C. 1
C^c phuong trinh phan ling : ' 210
(1) (2)
A C l 2+ 2 A g N 0 3 ^ 2 A g C l i + A(N03)2 B C l 2+2AgN03 2AgCl4'+ B(N03)2
Goi X va y la s6' mol cua ACI2 va BCI2 . ^
TheodSubai: (A + 71).x + (B + 71).y = 5,94 Theo (1) va (2) : n^gci = 2x + 2y = 0,12
Mu6'i khan g6m ĂN03)2 va B(N03)2 . Vay ta c6 : mmufii =(A+124)x + (B+124)y
= Ax + By + 124(x + y) = 1,68 + 124.0,06 = 9,12 gam
6.59. Dap an diing la Ạ ' ; -/
Phuong trinh phan ilng : 1
f 2Al+ Xa3 ^ AICI3 +X (1)
3,78
Theo (1) : lAl = = 27 = 0,14 mol
Ta c6 : (X + 35,5 . 3) . 0,14 - (133,5 . 0,14) = 4,06 gam. X = 56. Kim loai X la Fe, mudi la FeClg .
6.60. Dap so dung la Ạ / '\
Khi nung chi c6 NaHC03 bi phan huỵ
Goi X la s6' gam NaHC03. Phuong trinh phan ling nhiSt phan : 2NaHC03 — ^ NajCOj + CO2 t + H2OT
Cit 2 . 84 gam NaHC03 phan huy, khdi luong giam 44+18 gam (adsbygoogle = window.adsbygoogle || []).push({});