Đáp án C

n_NaCl =  = 0,3 mol

2NaCl + H₂SO₄ → Na₂SO₄ + 2HCl

0,3 (mol)    →                           0,3 (mol)

H% = 90% => n_HCl = 0,3. = 0,27 (mol)

V_HCl = 0,27.22,4 = 6,048 (lít)

\(2NaCl+H_2SO_4\rightarrow Na_2SO_4+2HCl\)

0,22_________________0,11____0,22

\(V_{HCl}=0,22.22,4=4,928\left(l\right)\)

\(m_{Na2SO4}=0,11.142=15,62\left(g\right)\)

Nhưng vì hiệu suất là 90% nên

\(V=\frac{4,928.90}{100}=4,4352\)

\(\rightarrow m=\frac{15,62.90}{100}=14,058\left(g\right)\)

1.
mNaCl lí thuyết = \(\dfrac{4,68.100}{80}\) = 5,85 (g)
=> nNaCl lí thuyết = \(\dfrac{5,85}{58,5}\) = 0,1 (mol)
2Na + Cl2 ----> 2NaCl
0,1 0,05 0,1 (mol)
=> mNa = 0,1.23 = 2,3 (g)
=> VCl2 = 0,05.22,4 = 1,12 (l)
2.

n_Zn = \(\dfrac{19,5}{65}\)= 0,3 (mol)

n_Cl2 = \(\dfrac{7}{22,4}\)= 0,3125 (mol)

Zn + Cl₂ ----> ZnCl₂

0,3 0,3 (mol)

Tỉ lệ: \(\dfrac{0,3}{1}<\dfrac{0,3125}{1}\)=> Zn phản ứng hết, Cl₂ phản ứng dư.

=> m_{ZnCl2 lí thuyết} 0,3.136 = 40,8 (g)

=> H = \(\dfrac{36,72.100}{40,8}\)= 90%

3.

Cu + Cl₂ ----> CuCl₂

0,2 0,2 (mol)

=> m_{CuCl2 lí thuyết} = 0,2.135 = 27 (g)

=> m_{CuCl2 thực tế} = \(\dfrac{27.83}{100}\)= 22,41 (g)

Bài 1:

\(M_X=21,8.M_{H_2}=21,8.2=43,6\left(\dfrac{g}{mol}\right)\\ Đặt:a=n_{C_3H_8}\left(mol\right)\left(a>0\right)\\ \Rightarrow\dfrac{44.a+42.\left(0,25-a\right)}{0,25}=43,6\\ \Leftrightarrow a=0,2\left(mol\right)\\ \Rightarrow n_{C_3H_8}=0,2\left(mol\right);n_{C_3H_6}=0,05\left(mol\right)\\ PTHH:C_3H_8+5O_2\rightarrow\left(t^o\right)3CO_2+4H_2O\\ 2C_3H_6+9O_2\rightarrow\left(t^o\right)6CO_2+6H_2O\\ n_{CO_2}=3.n_{hh}=3.0,25=0,75\left(mol\right)\\ \Rightarrow m_{CO_2}=0,75.44=33\left(g\right)\\ n_{H_2O}=4.0,2+3.0,05=0,95\left(mol\right)\\ \Rightarrow m_{H_2O}=18.0,95=17,1\left(g\right)\)

Bài 2:

\(n_{C_2H_5OH}=\dfrac{230}{46}=5\left(mol\right)\\ C_2H_4+H_2O\rightarrow\left(H^+,t^o\right)C_2H_5OH\\ n_{C_2H_4\left(LT\right)}=n_{C_2H_5OH}=5\left(mol\right)\\ Vì:H=40\%\Rightarrow n_{C_2H_4\left(TT\right)}=5:40\%=12,5\left(mol\right)\\ \Rightarrow m_{C_2H_4\left(TT\right)}=28.12,5=350\left(g\right)\)

Bài 3:

\(V_{khí.bay.ra}=V_{CH_4}=2,688\left(l\right)\\ \Rightarrow V_{anken}=5,6-2,688=2,912\left(l\right)\\ \Rightarrow n_{anken}=\dfrac{2,912}{22,4}=0,13\left(mol\right)\\ m_{bình.tăng}=m_{anken}=7,28\left(g\right)\\ \Rightarrow M_{Anken}=14n=\dfrac{7,28}{0,13}=56\left(\dfrac{g}{mol}\right)\\ \Leftrightarrow n=4\\ \Rightarrow CTPT.anken:C_4H_8\)

a) \(n_{Cu\left(NO_3\right)_2}=\dfrac{282}{188}=1,5\left(mol\right)\)

=> \(n_{Cu\left(NO_3\right)_2\left(pư\right)}=\dfrac{1,5.90}{100}=1,35\left(mol\right)\)
PTHH: 2Cu(NO₃)₂ --t^o--> 2CuO + 4NO₂ + O₂

______1,35------------>1,35------------->0,675

=> m_CuO = 1,35.80 = 108(g)

=> V_O2 = 0,675.22,4 = 15,12 (l)

b) Gọi số mol Cu(NO₃)₂ cần nung là a (mol)

=> \(n_{Cu\left(NO_3\right)_2\left(pư\right)}=\dfrac{90a}{100}=0,9a\left(mol\right)\)

PTHH: 2Cu(NO₃)₂ --t^o--> 2CuO + 4NO₂ + O₂

______0,9a---------------------->1,8a--->0,45a

=> (1,8a+0,45a).22,4 = 5

=> a = 0,0992 (mol)

=> \(m_{Cu\left(NO_3\right)_2}=0,0992.188=18,6496\left(g\right)\)

$n_{CaCO_3} = \dfrac{200}{100} = 2(mol)$
$CaCO_3 \xrightarrow{t^o} CaO + CO_2$
$n_{CaO} = n_{CaCO_3\ pư} = 2.90\% = 1,8(mol)$
$m_{CaO} = 1,8.56 = 100,8(gam)$

Chọn B

Chọn B