hãy tìm thể tích khí ở đktc :
A.0,2 mol CO2 ;0,25 mol O2
B.21g N2 ,8,8 g CO2
C.9.10 MŨ 23 phân tử H2 ;0,3 .10 mũ 23 phân tử CO
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\(m_{Al_2O_3}=n.M=0,5.102=51\left(g\right)\\ m_{Fe_2O_3}=n.M=0,2.160=32\left(g\right)\\ \Rightarrow m_{hh}=51+32=83\left(g\right)\)
\(n_{hh}=0,2.0,5=0,7\left(mol\right)\\ \Rightarrow V_{hh}=n.22,4=0,7.22,4=15,68\left(l\right)\)
mAl2O3=0,5.(27.2+16.3)=51g
mFe2O3=0,2.(56.2+16.3)=32g
Vco2=0,2.22,4=4,48g
Vn2=0,5.22,4=11,2g
a) \(n_{CuO}=\dfrac{4}{80}=0,05\left(mol\right)\)
b) \(V_{CO_2}=0,2.22,4=4,48\left(l\right)\)
c) \(M_A=1,172.29=34\left(g/mol\right)\)
\(n_A=\dfrac{33,6}{22,4}=1,5\left(mol\right)\)
=> mA = 1,5.34 = 51(g)
\(a.m_{Mg}=0,1.24=2,4\left(g\right)\\ m_{Ca}=0,2.40=8\left(g\right)\\ b.n_{hh}=\dfrac{2,8}{28}+\dfrac{13,2}{44}=0,4\left(mol\right)\\ \Rightarrow V_{hh}=0,4.22,4=8.96\left(l\right)\)
1.
\(a.\)
\(V_{hh}=\left(0.1+0.2+0.02+0.03\right)\cdot24=8.4\left(l\right)\)
\(b.\)
\(V_{hh}=\left(0.04+0.015+0.06+0.08\right)\cdot24=4.68\left(l\right)\)
\(2.\)
\(a.\)
\(V_{H_2}=0.5\cdot22.4=11.2\left(l\right)\)
\(V_{O_2}=0.8\cdot22.4=17.92\left(l\right)\)
\(b.\)
\(V_{CO_2}=2\cdot22.4=44.8\left(l\right)\)
\(V_{CH_4}=3\cdot22.4=67.2\left(l\right)\)
\(c.\)
\(V_{N_2}=0.9\cdot22.4=20.16\left(l\right)\)
\(V_{H_2}=1.5\cdot22.4=33.6\left(l\right)\)
V h h = 22,4 n O 2 + n H 2 + n O 2 = 22,4(0,75 + 0,25 + 0,5) = 33,6(l)
V C O 2 = n C O 2 . 22,4 = 0,25.22,4 = 5,6 (l)
V O 2 = n O 2 .22,4 = 0,25.22,4 = 5,6 (l)
n N 2 == 0,75(mol)
→ V N 2 = n N 2 .22,4 = 0,75.22,4= 16,8 (l)
n C O 2 == 0,2 (mol)
→ V C O 2 = n C O 2 . 22,4 = 0,2.22,4 = 4,48 (l)
n H 2 ==1,5(mol)
→ V H 2 = n H 2 . 22,4 = 1,5. 22,4 = 33,6 (l)
n C O == 0,05(mol)
→ V C O = n C O . 22,4 = 0,05. 22,4 = 1,12 (l)
\(V_{khi\left(dktc\right)}=22,4.n\\ V_{Cl_2\left(dktc\right)}=0,02.22,4=0,448\left(l\right)\\ V_{NH_3\left(dktc\right)}=2,5.22,4=56\left(l\right)\\ V_{CH_4\left(dktc\right)}=0,125.22,4=2,8\left(l\right)\\ V_{CO_2\left(dktc\right)}=0,25.22,4=5,6\left(l\right)\\ V_{O_2\left(dktc\right)}=0,25.22,4=5,6\left(l\right)\)
2:
a: \(V=0.2\cdot22.4=4.48\left(lít\right)\)
b: \(n_{N_3}=\dfrac{14}{42}=\dfrac{1}{3}\left(mol\right)\)
\(V=\dfrac{1}{3}\cdot22.4=\dfrac{224}{30}\left(lít\right)\)
3:
a: \(m_{CaCO_3}=0.5\cdot\left(40+12+16\cdot3\right)=50\left(g\right)\)
b: \(n_{SO_2}=\dfrac{5.6}{22.4}=0.25\left(mol\right)\)
\(m_{SO_2}=0.25\cdot\left(32+16\cdot2\right)=16\left(g\right)\)
Ở điều kiện tiêu chuẩn 0,02 mol của các chất khí đều có thể tích bằng nhau:
V C O = V C O 2 = V H 2 = V O 2 = 0 , 02 . 22 , 4 = 0 , 448 ( l )
A
\(V_{CO_2}=n\cdot22,4=0,2\cdot22,4=4,48\left(l\right)\\ n_{O_2}=n\cdot22,4=0,25\cdot22,4=5,6\left(l\right)\)
B
\(n_{N_2}=\dfrac{m}{M}=\dfrac{21}{14\cdot2}=0,75\left(mol\right)\\ V_{N_2}=n\cdot22,4=0,75\cdot22,4=16,8\left(l\right)\)
\(n_{CO_2}=\dfrac{m}{M}=\dfrac{8,8}{12+16\cdot2}=0,2\left(mol\right)\\ V_{CO_2}=n\cdot22,4=0,2\cdot22,4=4,48\left(l\right)\)
C
\(n_{H_2}=\dfrac{9\cdot10^{23}}{6\cdot10^{23}}=1,5\left(mol\right)\\ V_{H_2}=n\cdot22,4=1,5\cdot22,4=33,6\left(l\right)\)
\(n_{CO_2}=\dfrac{0,3\cdot10^{23}}{6\cdot10^{23}}=0,05\left(mol\right)\\ V_{CO_2}=n\cdot22,4=0,05\cdot22,4=1,12\left(l\right)\)