a)

$V_{O_2} = 0,2.22,4 = 4,48(lít)$

b)

$n_{SO_2} = \dfrac{76,8}{64} = 1,2(mol)$
$V_{SO_2} = 1,2.22,4 = 26,88(lít)$

c)

$n_{N_2} = \dfrac{7,5.10^{23}}{6.10^{23}} = 1,25(mol)$
$V_{N_2} = 1,25.22,4 = 28(lít)$

d)

$V_X = (0,2 + 0,25).22,4 = 10,08(lít)$

a) V(O2,đktc)=0,2.22,4=4,48(l)

b) V(SO2,đktc)= (76,8/64).22,4=26,88(l)

c) V(N2,đktc)= [(7,5.10²³)/(6.10²³)].22,4= 28(l)

d) VhhX(đktc)= V(O2,đktc) + V(N2,đktc)= 0,2.22,4+0,25.22,4=10,08(l)

F20: Tính thể tích ở đkc của :

a. 0,2 mol O₂

=> \(V_{O_2}=0,2.22,4=4,48\left(l\right)\)

b. 76,8 gam SO₂

\(n_{SO_2}=\dfrac{76,8}{32+16.2}=1,2\left(mol\right)\)

=> \(V_{SO_2}=1,2.22,4=26,88\left(l\right)\)

c. 7,5 .10²³ phân tử N₂ 

\(n_{N_2}=\dfrac{7,5.10^{23}}{6.10^{23}}=1,25\left(mol\right)\)

=> \(V_{N_2}=1,25.22,4=28\left(l\right)\)

V khí=(0,2+0,4+0,6+0,8).22,4=44,8l

a) m_{CuO = 0,25 x 80 = 20 (g)}

a)mCuO=0.25*(64+16)=20(g)

b)\(n_{MgCl_2}=\dfrac{19}{95}=0.2\left(mol\right)\)

Số phân từ MgCl₂ có trong 19g là 
0.2*6*10²³=1,2.10²³

c)
\(V_{hh}=\left(0.2+0.3+\dfrac{6.4}{32}\right).22,4=\left(0.5+0.2\right)=0.7\cdot22,4=15,68\left(l\right)\)

Đáp án là A. 46,15% 

\(a.m_{Mg}=0,1.24=2,4\left(g\right)\\ m_{Ca}=0,2.40=8\left(g\right)\\ b.n_{hh}=\dfrac{2,8}{28}+\dfrac{13,2}{44}=0,4\left(mol\right)\\ \Rightarrow V_{hh}=0,4.22,4=8.96\left(l\right)\)

a) \(n_{C_2H_4Br_2}=\dfrac{37,6}{188}=0,2\left(mol\right)\)

PTHH: C₂H₄ + Br₂ ---> C₂H₄Br₂
             0,2<---0,2<------0,2

b) \(\left\{{}\begin{matrix}V_{C_2H_4}=0,2.24,79=4,958\left(l\right)\\V_{CH_4}=20-4,958=15,042\left(l\right)\end{matrix}\right.\)

c) \(\left\{{}\begin{matrix}\%V_{C_2H_4}=\dfrac{4,958}{20}.100\%=24,79\%\\\%V_{CH_4}=100\%-24,79\%=75,21\%\end{matrix}\right.\)

d) \(V_{\text{dd}Br_2}=\dfrac{0,2}{0,2}=1\left(l\right)\)

a, \(C_2H_4+Br_2\rightarrow C_2H_4Br_2\)

b, \(n_{C_2H_4Br_2}=\dfrac{37,6}{188}=0,2\left(mol\right)\)

\(n_{C_2H_4}=n_{C_2H_4Br_2}=0,2\left(mol\right)\Rightarrow V_{C_2H_4}=0,2.22,4=4,48\left(l\right)\)

\(\Rightarrow V_{CH_4}=20-4,48=15,52\left(l\right)\)

c, \(\left\{{}\begin{matrix}\%V_{C_2H_4}=\dfrac{4,48}{20}.100\%=22,4\%\\\%V_{CH_4}=77,6\%\end{matrix}\right.\)

d, \(n_{Br_2}=n_{C_2H_4Br_2}=0,2\left(mol\right)\Rightarrow V_{ddBr_2}=\dfrac{0,2}{0,2}=1\left(l\right)\)

Đáp án D