HU&ng dan giai
^1 .. 45- 25 20 2
nig 15- 25 10 " 1 Ap dung cong thuTc (1): Ap dung cong thuTc (1):
Chon dap an C.
Bai 3: Hoa tan 3,164 gam h6n hop 2 muoi CaCOs va BaCOs bang dung dich HCl du, thu difoc 448 ml khi C O 2 (dktc). Thanh phan % so m o i dich HCl du, thu difoc 448 ml khi C O 2 (dktc). Thanh phan % so m o i
cua BaCOs trong hon hop la
Ạ 50%. B. 55%. C. 60%. D. 65%.
Hii&ng dan gidi
^ 3,164 nco = = 0.02 mol ^ M - nco = = 0.02 mol ^ M - 22,4 Ap dung so do dtfdng cheo: 0,02 = 158,2. BaCOg ( M ^ = 197) CaCOg (Mg = 100)' 58,2 %n BaCO, M = 158,2 .100% = 60%. 158,2-100= 58,2 197-158,2 = 38,8 58,2 + 38,8 Chon dap an C.
Bai 4: Mot h5n hop gom O2, O3 6 dieu kien tieu chuan c6 t i khoi hoi vdi
hidro la 18. Thanh phan % ve the tich cua O3 trong h6n hop la Ạ 15%. B. 25%. C. 35%. D. 45%. Ạ 15%. B. 25%. C. 35%. D. 45%.
Hiicfng dan gidi
Ap dung so do diicfng cheo: Vo M = 48 Vo M = 48 M = 18x2 = 36 M = 32 32-36 48-36 V o 3 _ 4 12 = i zz>%V. - 3 + 1 .100% = 25%. Chon dap an B.
ai 5: Can tron hai the tich metan vdi mot the tich dong d^ng X cua metan de thu duoc h6n hop khi c6 t i khoi hoi so v6i hidro bang 15. X la metan de thu duoc h6n hop khi c6 t i khoi hoi so v6i hidro bang 15. X la Ạ C3H8. B. C4H10. C. C5H12. D. CeHụ
HUdng dan gidi
Ap dung so do dufcfng cheo: Mtbinh = 15.2 = 30
M = 15.2 = 30 ^ Vc„ M = 16, M 2 - 3 O Vc„ M = 16, M 2 - 3 O VM, M = M . 16-30 'oil. M2 -30 14 = Y ^> IM2 - 30| = 28 =^ M2 = 58 => 14n + 2 = 58 => n = 4. Vay X la C4H10. Chon dap an B.
Bai 6: Hoa tan 200 gam SO3 vao m2 gam dung dich H2SO4 49% ta dtrgc dung dich H2SO4 78,4%. Gia tri cua m2 la dung dich H2SO4 78,4%. Gia tri cua m2 la
Ạ 133,3 gam. B. 146,9 gam. C. 272,2 gam. D. 300 gam.
Hiicing dan gidi
Phi/ong trinh phan iJng: SO3 + H2C) >H2S04
98.100 100 gam SO3 100 gam SO3
80 = 122,5 gam H2SO4. Nong do dung dich H2SO4 ttrong iJng 122,5%. Nong do dung dich H2SO4 ttrong iJng 122,5%.
Goi m i , m2 Ian laot la khoi lirong cua SO3 va dung dich H2SO4 49% can laỵ Theo (1) ta c6: can laỵ Theo (1) ta c6:
m m„ 1 _ 49-78,4 29,4 44 1 m, = ^ ^ . 2 0 0 = 300 gam. 122,5-78,4 44,1 29,4 phon dap an D.
ai 7: Nguyen tuf khoi trung binh cua brom la 79,319. Brom c6 hai dong vi ben: g^Br va *^Br. Thanh phan % so nguyen tuf cua l\Bx la vi ben: g^Br va *^Br. Thanh phan % so nguyen tuf cua l\Bx la
Ạ 84,05. B. 81,02. C. 18,98. D. 15,95.
Hiidng dan gidi
IIBT ( M = 8 1 ) ^^Br ( M = 79) ^^Br ( M = 79) A = 79,319 7 9 , 3 1 9 - 7 9 = 0,319 8 1 - 7 9 , 3 1 9 = 1,681 %llBr 0,319 Br = 0,319 1,681 + 0,319 .100% = 15,95%. % 3 5 B r 1,681 C h o n dap a n D .
B a i 8: T h e m 250 m l dung dich N a O H 2 M v a o 200 m l dung dich H 3
1,5M. Muoi tao t h a n h v a k h o i Itfcfng tUOng ufng l a Ạ 14,2 gam N a z H P O i ; 32,8 gam Na3P04.
B. 28,4 gam N a 2 H P 0 4 ; 16,4 gam Na3P04. C . 12 gam N a H 2 P 0 4 ; 28,4 gam N a 2 H P 0 4 . C . 12 gam N a H 2 P 0 4 ; 28,4 gam N a 2 H P 0 4 . D. 24 gam N a H 2 P 0 4 ; 14,2 gam Na2HP04.
Hit&ng dan gidi
0,2.1,5 3 n M , P O ,
Tao ra h6n hop 2 muoi: NaH2P04, Na2HP04.
So do diicfng cheo: N a ^ H P O , n , = 2 _ 5 - N a H 2 P 0 , n2 = l 1 - ^ 3 2 - i 3 2 3 1^ 3 M a ^ N a ^ H P O , + ^ ^ N a l l j l ' O , = ^ H a P O ^ ~ 0, 3 m o l jnNa^ H P o , = 0 , 2 m o l j n N a H . P O , = 0 . 1 m o l mNa,HPo, =0,2.142 = 28,4 gam n NalloPO, ,^ =0,1.120 = 12 g a m Chon dap a n C.
p a i 9: Can lay bao nhieu gam t i n h the CUSO4.5H2O va bao nhieu gam dung dich C U S O 4 8% de pha t h a n h 280 gam dung dich C U S O 4 16%? dung dich C U S O 4 8% de pha t h a n h 280 gam dung dich C U S O 4 16%?
Ạ 180 gam va 100 gam. B. 330 gam va 250 gam. C. 60 gam va 220 gam. D. 40 gam va 240 gam.
Hiidng dan gidi
C U S O 4 . 5 H 2 0- > T a coi C U S O 4 . 5 H 2 O nhir la dung dich C U S O 4 c6:
160 250 250
250
Goi m i l a khoi liTOng c u a C U S O 4 . 5 H 2 O v a m2 l a khoi li/gfng c u a d u n g
dich C U S O 4 8%.
Theo so do difdng cheo:
( m , ) 6 4 ( m j 8 16 8-16[ = 8 6 4 - 1 6 = 48 m m„ 1 _ _8^ 48 6
M&t khac m i + m2 = 280 gam.
Vay k h o i ItTOng C U S O 4 . 5 H 2 O la: m i = 280
1 + 6 .1 = 40 gam Va khoi lirgng dung dich C U S O 4 8% la:
m2 = 280 - 40 = 240 gam Chon dap an D.
B a i 1 0 : Can bao nhieu l i t axit H 2 S O 4 (D = 1,84) va bao nhieu l i t nirdc cat de pha t h a n h 9 l i t dung dich H 2 S O 4 c6 D = 1,28 gam/ml?
Ạ 2 l i t va 7 l i t . B. 3 l i t va 6 l i t C. 4 l i t va 5 l i t . D. 6 l i t va 3 l i t . I HU&ng đn gidi Ta CO so do dtfdng cheo: ( D „ o = i g/ml) I up: 1 , H,SO,: m" 1,28 11,84-1,281=0,56 11,28-11 = 0,28
^ VH,O ^ 0,56 ^ 2
^ V„^30, 0,28 1 •
Can phai lay - ^ . 9 = 3 l i t H 2 S O 4 (d = 1,84 g/ml) va 6 l i t H2Ọ
1 + 2 Chon đp an B. Chon đp an B.
MQT SO BAI TAP VAN DUNG
B a i 1: Hoa tan hoan toan m gam Na20 nguyen chat vao 40 gam dung dich NaOH 12% thu ducfc dung dich NaOH 5 1 % . Gia t r i cua m (gam) la
Ạ 11,3. B. 20,0. C. 31,8. D. 40,0.
B a i 2: The tich n\idc nguyen chat can t h e m vao 1 Ht dung dich H2SO4
98% (d = 1,84 g/ml) de ducfc dung dich mdi c6 nong do 10% la
Ạ 14,192 m l . B. 15,192 m l . C. 16,192 m l . D. 17,192 m l .
B a i 3: Nguyen tuf k h o i trung binh cua dong 63,54. Dong c6 hai dong vi
ben: ^^Cu va ^^Cu T h a n h phan % so nguyen tuf cua ^^Cu la Ạ 73,0%. B. 34,2%. C.32,3%. D. 27,0%.
B a i 4: Can lay V i l i t CO2 va V2 l i t CO de c6 dtfofc 24 Ht hon hop CO2 vii
CO CO t i khoi hcfi doi vdi metan b^ng 2. Gia t r i cua V i (lit) la Ạ 2. B. 4. C. 6. D. 8.
B a i 5: Hoa tan 2,84 gam h5n hop 2 muoi CaCOs va MgCOa b^ng dung dich H C l (dir) thu daoc 0,672 l i t k h i d dieu kien tieu chuan. Thanh phan % so mol cua MgCOs trong h6n hop la
Ạ 33,33%. B. 45,55%. C. 54,45%. D. 66,67%.
B a i 6: Lucfng S O 3 can t h e m vao dung dich H 2 S O 4 10% de dUcfc 100 gam dung dich H 2 S O 4 20% la
Ạ 2,5 gam. B. 8,88 gam. C. 6,66 gam. D. 24,5 gam.
B a i 7: Dung dich mau etylic 13,8° c6 d (g/ml) = ? Biet dc^„^oH(ng.cf.t) = 0-8 g / m l ; d„^o = 1 g / m l .
Ạ 0,805. B. 0,8 55. C. 0,972. D. 0,915.
B a i 8: Hoa tan m gam A l bSng dung dich HNO3 loang thu diJgfc h6n hdp k h i N O va N2O c6 t i khoi so vdi H2 bang 16,75. T i le the tich k h i trong h6n hgfp la
Ạ 2 : 3. B. 1 : 2. C. 1 : 3. D. 3 : 1.
Jai 9: Can t h e m bao nhieu gam nude v^o 500 g dung dich N a O H 12% de CO dung dich N a O H 8%?
Ạ 250 g B. 125 g C. 750 g D. K e t qua khac.
Jai 10: M o t dung dich H C l nong do 4 5 % va mot dung dich H C l khac c6