- VI, Fe co nd => AgN03,Cu(N03)2 phai phan ling hét Dodo dung dic hX chua A1(N03)3 va Fe(N03)
11. Hoatan hoan toan h6n hcrp g6m 0,12mol FeS^ v aa mol CujS vao axit HNO (vira du, thu duoc dung djch X, chi chiia hai mudi sunfat) va khi duy nhát NO
(vira du, thu duoc dung djch X, chi chiia hai mudi sunfat) va khi duy nhát NO Gia trj ciia a la
Ạ 0,06. B.0,04. C. 0,075. D.0,12.
Hu&ng đn giai
Ta CO so do phan line:
2FeS2 ^ Fe2(S04)3 + SÔ" ( i ) '«'
0,12(mol) 0,06 (mol)
CụS 2CUSO4 - SÔ" (2)
ămol) a (mol) t | '
Trong dung djch X (dung djch sau phan ling) chi thu duoc 2 mudi sunfat
(CUSO4, Fe2(S04)3, khdng c6 H,S04)
=^ n 2- (du o ( D ) = n 2- (thiéu 6 (2)) 0,06 (mol) = a (mol) '
vay a = 0,06. Dap an diing la Ạ
12. Cho tirng chat: Fe, FeO, Fe(OH),, Fe(OH)3, Fe304, Fe203, Fe(N03),, Fe(N03)3,
FeS04, Fe2(804)3, FeCOj Idn luot phan ling v6i HNO3 dac, nong. Sd phan ung thuoc loai phan ling oxi hoa - khiJr la
Ạ 5. B. 8. C.6. D.7. .ft ••,
Hu&ng đn giai
Sat va hop chait ciia sat tac dung vdi HNO3, xay ra phan ihig oxi hoa - khii khi sat
CO sd oxi hoa bang 0 hoac + 2, + 8/3 (tháp hon + 3). Do do cac chát Fe (0), FeO (+2), Fe(OH)2 (+2), Fe304 (+ 8/3), Fe(N03)2 (+ 2), FeS04 (+ 2), FeCO, (+ 2), (7 chát) khi phan vdi HNO3 d6u xay ra phan ufng oxi hoa - khir.
vay sd phan ling oxi hoa - khir la 7.
Dap an diing la D. 13. Hoa tan hoan toan 2,81 gam hdn hop g6m FcjOj, MgO, ZnO trong 500 ml axit
H2SO4 0,1M (vira dii). Sau phan ling, hdn hop mudi sunfat khan thu duoc khi c6 can dung djch c6 khdi luong la
Ạ 3,81 gam. B. 5,81 gam. C. 4,81 gam. D. 6,81 gam.
Hu&ngđngidi
Theo bai ra: nH2S04 = 0-5 • 0.1 =0,05 (mol). ''Ws'^
Oxit + H 2 S O 4 > mu6'i sunfat + HjO - Ap dung djnh luat bao loan nguyen t6'(cho nguyen t6'H),ta c6:
n H 2 0 = n H 2 S 0 4 = 0.05 (mol) ^ ^
- Theo dinh luat bao loan kh6'i luong, ta c6:
nioxi, + m H 2 S 0 4 = mmuoi + m "
=> m,„„,i = m„i, + m H 2 S 0 4 - " I M J O = 2,81 + 0,05 . 98 - 0,05 . 18 = 6,81 (gam). V *.,,;••''''<':' Dap an dung la D. 14. Hoa tan hoan toan Fe304 trong dung djch H2SO4 loang (du) diroc dung dich X,.
Cho luong du bot Fe vao dung djch X, (trong didu kien kh6ng c6 khong khO den khi phan dtig xay ra hoan toan, thu dugc dung djch X , chiia chat tan la
Ạ FeS04. B. Fe2(S04)3 va H2SO4.
C. FeS04 va H2SO4. D. Fe2(S04)3.
. .) Huong dan gidi
Cac phuomg trinh phan iJng xay ra:
Fe304 + 4H2SO4 (1) > Fe2(S04)3 + FeS04 + 4H2O
Fe + H2SO4 (1) > FeS04 +
Pe + Fe2(S04)3 > 3FeS04 Sau phan utig thu duac FeS04.
Dap an dung la Ạ
15. Cho day cac cha't: FeO, Fe(0H)2, FeS04, Fe304, Fe2(S04)3, FejOj. S6' cha't trong day bj oxi hoa khi tac dung vdri dung dich HNO3 dac, nong la day bj oxi hoa khi tac dung vdri dung dich HNO3 dac, nong la
Ạ 5. B. 6. C. 3. D . 4 .
Dap an dung la D. 16. D6't chay hoan toan m gam FeS, bang m6t long vura du, thu dugc khi X. Háp
thu het X vao 1 lit dung dich chiia BăOH)2 0,15M va K O H 0,1M, thu dugc dung djch Y va 21,7 gam kd't tuạ Cho Y vao dung djch NaOH, tháy xuát hi6n thdm ket tuạ Gia tri ciia m la
Ạ 24,0. B. 12,6. C.23,2 D. 18,0
Huong dan gidi
Theo bai ra: n^Qj^j ==0,15mol;n,^OH-O,lmol; |,| v
12
" B a s o j =21,7/217 = 0,lmol Suyra: n^^_ -0,15.2 + 0,1 = 0,4(mol)
n^2+ -0,15(mol)
228
CtyTNHH MTV DVVH Kluinf> Vic
PTHH: 4FeS2 + l I O j >8SO2 T +2Fe203
m 2m 120 SO2 + O H " >HS03 0,3 < - ( 0 , 4 - 0 1 ) HSO3 + O H " —> s d l ~ + H2O 0,1 < 0,1 (mol) 120 -
i 1) n* v 8 » '^rro miki n&i rJ.i ndj •> : '
1 '
SOJ- + Ba 2+ BaSOj i
0,1 (0,1<0,15) < - 0,1
Ta c6: ^ = 0 , 3 ^ m = 0,3.60 = 18,0(gam) Dap an dung la D.
17. Trong cac chát: FeCl,, FeCl3, Fe(N03)3, FeS04, Fe,(S04)3. Só chát c6 ca tính oxi hoa va tinh khir la hoa va tinh khir la
Ạ 2 B. 4 C. 5
Huong đn gidi
Cac chát C O ca tinh oxi hoa va tinh khir la:
D. 3
i rag'-'
FeClj,FeCl3, Fe (NO3 ) ^; Fe (NO3 )^,FeSÔ (5 chat)
+2 - I
That vay: FeCl2
+3 - I 0 0 0 0 Fe + CỊ 0 0 2FeCl, > 2Fe + 301. 'M torn +2 f +5-2 ^ ,0 +3 +4 0 4Fe NO - ^ 2 F e 2 0 3 + 8N02 + 02 +3 f +5-2 ^ NO3 4Fe +3
-!—> 2 Fe203 +12 NO2 + 3O2
t„.
+2 0
Fe SO4 + Zn > Fe+ ZnS04
+2 +3
6 Fe SO4 + 3CI2 > 2 Fe2 (SO4 )^ + 2¥eC\^
Dap an dung la C.
18. Cho m gam M g vao dung dich chiJa 0,12 mol FeCl3. Sau khi phan ilng xay ra hoan toan thu dugc 3,36 gam cha't ran. Gia trj ciia m la hoan toan thu dugc 3,36 gam cha't ran. Gia trj ciia m la
Ạ 2,88 B.4,32 C. 5,04 D. 2,16
Huong đn gidi
Pluin lodi \,I !>/iiniiir /'ill//' "Idi nluinli Kl /!'>>• h.h 12 -Cii Thanh Toan
Do do PTHH cac phan ling c6 th^ xay ra:
i ' : Mg + Fê^ ^ F e i+ M g ^ ^ (2)
IT!:
- V i CO chai^t ran sau phan urng nen (1) xay ra hoan toan (tfnh theo Fe )
- V I mp^(p^ci3) =0,12.56 = 6,72(g)>3,36(g)=:> phan ling (2) xay ra mot phSn (Fê^ con du => Mg phan ling hfét, do do chat ran thu dugc la Fe). ' ' Theo (1): n^g(,) =0,12/2 = 0,06(mol) t o
Theo (2): npg-3,36/56 = 0,06(mol)
= > " M g{ 2) = 0 ' 0 6 ( m o l )
^ V a y m = (0,06 + 0,06).24 = 2,88(g)
Dap an dung la Ạ
• Chu v: Khong nen viet va tính toan theo PTHH:
3Mg + 2FeCl3 ^3MgCl2 + 2Fe i
19. Nung m gam h6n hop X gom FeS va FeS^ trong m6t binh kin chufa khdng khi (g6m 20% thé tich va 80% th^ tich N,) den khi cac phan ling xay ra hoan