d b c b d

$n_{Al(NO_3)_3} = n_{Al} = 0,28(mol)$
$n_{Zn(NO_3)_2} = n_{Zn} = 0,18(mol)$

$\Rightarrow m_{NH_4NO_3} = m_{muối} - m_{Al(NO_3)_3} - m_{Zn(NO_3)_2} = 99,66 - 0,28.213 - 0,18.189 = 6(gam)$

$\Rightarrow n_{NH_4NO_3} = 0,075(mol)$

Bảo toàn electron : 

$3n_{Al} + 2n_{Zn} = 8n_{NH_4NO_3} + 3n_{NO}$

$\Rightarrow n_{NO} = 0,2(mol)$

Đáp án B

Đặt số mol CH₄; C₂H₄; C₂H₂ lần lượt là x;y;z ( mol )

\(\Rightarrow m_X=16x+28y+26z=17,2\left(g\right)\)       (1)

\(CH_2=CH_2+Br_2\rightarrow CH_2Br-CH_2Br\)

    y          y                     ( mol )

\(CH\equiv CH+2Br_2\rightarrow CHBr_2-CHBr_2\)

   z          2z                       ( mol )

\(n_{Br_2}=y+2z=\dfrac{96}{160}=0,6\left(mol\right)\)   ( 2)

Đặt phần sau bằng k lần phần đầu

\(n_{hhk}=kx+ky+kz=\dfrac{6,72}{22,4}=0,3\left(mol\right)\)  (3)

\(n_{AgC\equiv AgC}=\dfrac{18}{240}=0,075\left(mol\right)\)

\(CH\equiv CH+Ag_2O\underrightarrow{ddNH_3}AgC\equiv AgC\downarrow+H_2O\)

     0,075                                     0,075                ( mol )

\(\Rightarrow kz=0,075\left(mol\right)\) (4)

\(\dfrac{\left(3\right)}{\left(4\right)}\Rightarrow\dfrac{kx+ky+kz}{kz}=\dfrac{0,3}{0,075}=4\)

\(\Leftrightarrow x+y+z=4z\)

\(\Leftrightarrow x+y-3z=0\)   (5)

\(\left(1\right);\left(2\right);\left(5\right)\Rightarrow\left\{{}\begin{matrix}x=0,4\\y=0,2\\z=0,2\end{matrix}\right.\)

\(\%V_{CH_4}=\dfrac{0,4}{0,4+0,2+0,2}.100=50\%\)

`->` Chọn A

22) \(n_{C_3H_6}=\dfrac{2,52}{42}=0,06\left(mol\right)\)

PTHH: \(2C_3H_6+9O_2\xrightarrow[]{t^o}6CO_2+6H_2O\)

             0,06------------->0,18---->0,18

\(\Rightarrow m_{t\text{ăng}}=0,18.\left(44+18\right)=11,16\left(g\right)\)

Chọn B

23) Propan là \(CH_3-CH_2-CH_3\). Chọn D

24) Chất không tạo kết tủa là \(CH_3-C\equiv C-CH_3\) do không phải là ank-1-in

\(CH\equiv CH+2AgNO_3+2NH_3\rightarrow CAg\equiv CAg\downarrow+2NH_4NO_3\\ CH_3-C\equiv CH+AgNO_3+NH_3\rightarrow CH_3-C\equiv CAg\downarrow+NH_4NO_3\\ CH\equiv C-CH=CH_2+AgNO_3+NH_3\rightarrow CAg\equiv C-CH=CH_2\downarrow+NH_4NO_3\)

Chọn A

25) BTNT: \(\left\{{}\begin{matrix}n_C=n_{CO_2}=0,9\left(mol\right)\\n_H=2n_{H_2O}=1,2\left(mol\right)\end{matrix}\right.\Rightarrow m=0,9.12+1,2=12\left(g\right)\)

Chọn C

26) \(CH_4+4Cl_2\xrightarrow[]{a/s}CCl_4+4HCl\)

Chọn D

Có đáp số 6(mJ) ko bạn?

#\(Errink \times Cream\)

#\(yGLinh\)

Câu 27:

\(C_3H_4+AgNO_3+NH_3\rightarrow C_3H_3Ag+NH_4NO_3\\ C_2H_2+2AgNO_3+2NH_3\rightarrow Ag_2C_2+2NH_4NO_3\\ n_{C_3H_4}=\dfrac{1,8}{40}=0,045\left(mol\right);n_{C_2H_2}=\dfrac{0,52}{26}=0,02\left(mol\right)\\ n_{C_3H_3Ag}=n_{C_3H_4}=0,045\left(mol\right)\\ n_{Ag_2C_2}=n_{C_2H_2}=0,02\left(mol\right)\\ m_{kt}=m_{C_3H_3Ag}+m_{Ag_2C_2}=0,045.147+240.0,02=11,415\left(g\right)\\ Chọn.B\)

\(n_{Br_2}=\dfrac{32}{160}=0,2\left(mol\right)\\ Đặt:n_{C_3H_6}=a\left(mol\right);n_{C_3H_4}=b\left(mol\right)\\ PTHH:C_3H_6+Br_2\rightarrow C_3H_6Br_2\\ C_3H_4+2Br_2\rightarrow C_3H_4Br_4\\ \Rightarrow\left\{{}\begin{matrix}42a+40b=6,2\\a+2b=0,2\end{matrix}\right.\Leftrightarrow\left\{{}\begin{matrix}a=0,1\\b=0,05\end{matrix}\right.\\ \Rightarrow\%m_{C_3H_6}=\dfrac{0,1.42}{6,2}.100\approx67,74\%\\ Chọn.A\)

\(n_{Br_2}=\dfrac{0,8}{160}=0,005\left(mol\right)\\ C_2H_4\left(dư\right)+Br_2\rightarrow C_2H_4Br_2\\ n_{C_2H_4\left(dư\right)}=n_{Br_2}=0,005\left(mol\right)\\ n_{C_2H_4\left(đã.p.ứ.với.H_2\right)}=\dfrac{2,24}{22,4}-0,005=0,095\left(mol\right)\\ C_2H_4+H_2\rightarrow\left(Ni,t^o\right)C_2H_6\\ Vì:\dfrac{0,095}{1}< \dfrac{3,36:22,4}{1}\Rightarrow C_2H_4hết,H_2dư\\ H=\dfrac{0,095}{0,1}.100\%=95\%\\ Chọn.C\)

10. a present was sent to me last week
11. More information was given to us by her 

Câu 23: C

Câu 24: C

a