B\u00e0i 3 (trang 91 SGK H\u00f3a 12):\u00a0Trong h\u1ee3p kim Al \u2013 Ni c\u1ee9 10 mol Al th\u00ec c\u00f3 1 mol Ni. Ph\u1ea7n tr\u0103m kh\u1ed1i l\u01b0\u1ee3ng c\u1ee7a h\u1ee3p kim n\u00e0y l\u00e0 ph\u01b0\u01a1ng \u00e1n n\u00e0o sau \u0111\u00e2y.<\/strong><\/p>\nA. 81% Al v\u00e0 19% Ni.<\/p>\n
B. 82% Al v\u00e0 18% Ni.<\/p>\n
C. 83% Al v\u00e0 17% Ni.<\/p>\n
D. 84% Al v\u00e0 16% Ni.<\/p>\n
L\u1eddi gi\u1ea3i:<\/b><\/p>\n
\u0110\u00e1p \u00e1n B.<\/p>\n
Kh\u1ed1i l\u01b0\u1ee3ng Al l\u00e0 mAl<\/sub>\u00a0= 27 x 10 = 270 (g)<\/p>\nKh\u1ed1i l\u01b0\u1ee3ng Ni l\u00e0 mNi<\/sub>= 59 . 1 = 59 (g)<\/p>\nKh\u1ed1i l\u01b0\u1ee3ng h\u1ed7n h\u1ee3p mhh<\/sub>\u00a0= mAl<\/sub>\u00a0+ mNi<\/sub>\u00a0= 270 + 59 = 329 (g)<\/p>\nTh\u00e0nh ph\u1ea7n % theo kh\u1ed1i l\u01b0\u1ee3ng<\/p>\n
%mAl<\/sub>\u00a0= 270\/329 x 100% = 82%<\/p>\n%mNi<\/sub>\u00a0= 59\/329 x 100% = 18%<\/p>\nB\u00e0i 4 (trang 91 SGK H\u00f3a 12):\u00a0Ng\u00e2m 2,33 gam h\u1ee3p kim Fe \u2013 Zn trong dung d\u1ecbch HCl \u0111\u1ebfn ph\u1ea3n \u1ee9ng ho\u00e0n to\u00e0n th\u1ea5y gi\u1ea3i ph\u00f3ng 896 ml kh\u00ed H2<\/sub>(\u0111ktc). Th\u00e0nh ph\u1ea7n % c\u1ee7a h\u1ed7n h\u1ee3p l\u00e0 ph\u01b0\u01a1ng \u00e1n n\u00e0o sau \u0111\u00e2y.<\/strong><\/p>\nA. 27,9% Zn v\u00e0 72,1% Fe.<\/p>\n
B. 26,9% Zn v\u00e0 73,1% Fe.<\/p>\n
C. 25,9% Zn v\u00e0 74,1% Fe.<\/p>\n
D. 24,9% Zn v\u00e0 75,1% Fe.<\/p>\n
L\u1eddi gi\u1ea3i:<\/b><\/p>\n
Ph\u01b0\u01a1ng tr\u00ecnh ph\u1ea3n \u1ee9ng<\/p>\n
Fe + 2HCl \u2192 FeCl2<\/sub>\u00a0+ H2<\/sub><\/p>\nZn + 2HCl \u2192 ZnCl2<\/sub>\u00a0+ H2<\/sub><\/p>\nG\u1ecdi x, y l\u1ea7n l\u01b0\u1ee3t l\u00e0 s\u1ed1 mol Fe v\u00e0 Zn trong h\u1ed7n h\u1ee3p<\/p>\n
S\u1ed1 mol H2<\/sub>\u00a0l\u00e0 nH2<\/sub>\u00a0= 896 \/ 1000 x 22,4 = 0,04(mol)<\/p>\nmhh<\/sub>\u00a0= 56x + 65y = 2,33.<\/p>\nGi\u1ea3i h\u1ec7 ph\u01b0\u01a1ng tr\u00ecnh ta c\u00f3: x = 0,03; y = 0,01.<\/p>\n
Th\u00e0nh ph\u1ea7n % theo kh\u1ed1i l\u01b0\u1ee3ng h\u1ed7n h\u1ee3p l\u00e0 :<\/p>\n
%mFe<\/sub>\u00a0= 0,03.56\/2,33 x 100% = 72,1%<\/p>\n%mZn<\/sub>\u00a0= 0,01.65\/2,33 x 100% = 27,9%<\/p>\n <\/p>\n
<\/div>\n
<\/div>\n<\/div>\n<\/div>\n","protected":false},"excerpt":{"rendered":"
B\u00e0i 1 (trang 91 SGK H\u00f3a 12):\u00a0Nh\u1eefng t\u00ednh ch\u1ea5t v\u1eadt l\u00ed chung c\u1ee7a kim lo\u1ea1i tinh khi\u1ebft bi\u1ebfn \u0111\u1ed5i th\u1ebf n\u00e0o khi bi\u1ebfn th\u00e0nh h\u1ee3p kim? L\u1eddi gi\u1ea3i: H\u1ee3p kim d\u1eabn \u0111i\u1ec7n v\u00e0 nhi\u1ec7t k\u00e9m h\u01a1n kim lo\u1ea1i nguy\u00ean ch\u1ea5t. – \u0110\u1ed9 c\u1ee9ng c\u1ee7a h\u1ee3p kim h\u01a1n h\u01a1n \u0111\u1ed9 c\u1ee9ng c\u1ee7a kim lo\u1ea1i nguy\u00ean ch\u1ea5t, […]<\/p>\n","protected":false},"author":3,"featured_media":24483,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_mi_skip_tracking":false,"tdm_status":"","tdm_grid_status":""},"categories":[1305],"tags":[1419,1420],"yoast_head":"\n
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<\/p>\n