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a.
\(m_{Al}=0.5\cdot27=13.5\left(g\right)\)
\(m_{CO_2}=\dfrac{6.72}{22.4}\cdot44=13.2\left(g\right)\)
\(m_{N_2}=\dfrac{5.6}{22.4}\cdot28=7\left(g\right)\)
\(m_{CaCO_3}=0.25\cdot100=25\left(g\right)\)
b.
\(m_{hh}=\dfrac{3.36}{22.4}\cdot2+\dfrac{5.6}{22.4}\cdot28+0.2\cdot44=16.1\left(g\right)\)
![](https://rs.olm.vn/images/avt/0.png?1311)
a. \(m_{CO_2}=\dfrac{8,96}{22,4}.44=17,6\left(g\right)\)
b. \(m_{Fe}=\dfrac{1,8.10^{22}}{6.10^{23}}.56=1,68\left(g\right)\)
c. \(m_{Fe_2\left(SO_4\right)_3}=0,25.400=100\left(g\right)\)
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Câu 1:
a) \(m_{Fe_2\left(SO_4\right)_3}=0,15.400=60\left(g\right)\)
b) \(m_{MgCl_2}=0,05.95=4,75\left(g\right)\)
c) \(m_{H_2}=0,2.2=0,4\left(g\right)\)
d) \(n_{N_2}=\dfrac{4,48}{22,4}=0,2\left(mol\right)\Rightarrow m_{N_2}=0,2.28=5,6\left(g\right)\)
e) \(n_{O_2}=\dfrac{6,72}{22,4}=0,3\left(mol\right)\Rightarrow m_{O_2}=0,3.32=9,6\left(g\right)\)
Câu 2:
a) \(V_{NO_2}=0,25.22,4=5,6\left(mol\right)\)
b) \(V_{CO_2}=0,3.22,4=6,72\left(mol\right)\)
c) \(n_{Cl_2}=\dfrac{3,55}{35,5}=0,1\left(mol\right)\Rightarrow V_{Cl_2}=0,1.22,4=2,24\left(l\right)\)
d) \(n_{N_2O}=\dfrac{1,32}{44}=0,03\left(mol\right)\Rightarrow V_{N_2O}=0,03.22,4=0,672\left(l\right)\)
![](https://rs.olm.vn/images/avt/0.png?1311)
a)
\(n_{SO_2}=\dfrac{m}{M}=\dfrac{3,2}{64}=0,05\left(mol\right)\\ n_{CO_2}=\dfrac{V_{\left(\text{đ}ktc\right)}}{22,4}=\dfrac{3,36}{22,4}=0,15\left(mol\right)\)
b)
\(n_{Cl_2}=\dfrac{V_{\left(\text{đ}ktc\right)}}{22,4}=\dfrac{1,344}{22,4}=0,06\left(mol\right)\Rightarrow m_{Cl_2}=n.M=0,06.71=4,26\left(mol\right)\\ n_{Na_2CO_3}=n.M=0,5.106=53\left(g\right)\)
c)
\(V_{N_2\left(\text{đ}ktc\right)}=n.22,4=0,25.22,4=5,6\left(l\right)\\ n_{O_2}=\dfrac{m}{M}=\dfrac{4,8}{32}=0,15\left(mol\right)\Rightarrow V_{O_2\left(\text{đ}ktc\right)}=n.22,4=0,15.22,4=3,36\left(l\right)\)
bạn giải cho mình thêm dc ko ạ
Hãy tính thể tích không khí cần dùng để đốt cháy hoàn toàn 13,44 lit khí B. Biết rằng: - Khí Oxi chiếm 1/5 thể tích không khí. - Khí B có tỉ khối so với hidro bằng 8. Thành phần % theo khối lượng của khí B là 75%C và 25% H.
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\(a.n_{NaOH}=\dfrac{0,4}{40}=0,01\left(mol\right)\\ b.n_{H_2O}=\dfrac{0,6.10^{23}}{6.10^{23}}=0,1\left(mol\right)\\ m_{H_2O}=0,1.18=1,8\left(g\right)\)
\(c.n_{O_2}=\dfrac{9,6}{16}=0,6\left(mol\right)\\ V_{O_2}=0,6.22,4=13,44\left(l\right)\\ d.n_{CO_2}=\dfrac{5,6}{22,4}=0,25\left(mol\right)\\ Số.phân.tử.là:0,25.6.10^{23}=1,5.10^{23}\left(phân.tử\right)\)
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a.\(m_{CO_2}=\dfrac{4,48}{22,4}.44=8,8g\)
b.\(n_{CH_4}=\dfrac{2,8}{22,4}=0,125mol\)
c.\(V_{Cl_2}=0,25.22,4=5,6l\)
a) nCo2= V/22,4= 4,48/22,4= 0,2(mol) mCo2= n.M= 0,2.44=8.8(g) b) nCH4= V/22,4= 2,8/22,4=0,125(mol) c) VCl2=n.22,4= 0,25.22,4=5,6(l)
![](https://rs.olm.vn/images/avt/0.png?1311)
Tính khối lượng:
a) 0,3 mol khí CO2
(CO2 = 12 + 16.2 = 44 g/mol)
=. m = n . M = 0,3 . 44 = 13,2g
b) 67,2 lít khí CH4 (ở đktc)
n = \(\dfrac{V}{24,79}=\dfrac{67,2}{24,79}=2,710mol\)
(CH4 = 12 + 1.4 = 16 g/mol)
=> m = n . M = 2,710 . 16 = 43,36g
c) 896 cm3 khí CO2
896 cm3 = 0,896l
\(n=\dfrac{V}{24,79}=\dfrac{0,896}{24,79}=0,036mol\)
(CO2 = 12 + 16.2 = 44 g/mol)
=> m = n . M = 0,036 . 44 = 1,584g
d) 11,2 dm3 khí O2
11,2 dm3 = 0,0112l
\(n=\dfrac{V}{24,79}=\dfrac{0,0112}{24,79}=4,517mol\)
(O2 = 16.2 = 32 g/mol)
=> m = n . M = 4,517 . 32 = 144,544g.
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\(V_{CO_2}=0,5.22,4=11,2\left(l\right)\)
\(A_{CO_2}=0,5.6.10^{23}=3.10^{23}\) (phân tử \(CO_2\) )
2.
\(n_{CO_2}=\dfrac{2,24}{22,4}=0,1\left(mol\right)\)
=> \(n_C=n_{CO_2}=0,1\left(mol\right)\) (1)
=> \(n_O=2nCO_2=0,1.2=0,2\left(mol\right)\) (*)
\(n_{H_2O}=\dfrac{3,6}{18}=0,2\left(mol\right)\)
=> \(n_H=2n_{H_2O}=0,2.2=0,4\left(mol\right)\) (2)
=> \(n_O=n_{H_2O}=0,2\left(mol\right)\) (**)
\(n_{O_2}=\dfrac{4,8}{22,4}=0,2\left(mol\right)\)
=> \(n_O=2n_{O_2}=2.0,2=0,4\left(mol\right)\) (3)
\(X+O_2\underrightarrow{t^o}CO_2+H_2O\)
Từ (1),(2),(3), (*), (**) suy ra: \(n_C:n_H:n_O=0,1:0,4:0\)
=> Công thức tổng quát của X là \(C_xH_y\)
có: \(x:y=n_C:n_H=0,1:0,4=1:4\)
=> X là: \(CH_4\)
Sơ đồ pứ: \(CH_4+2O_2\underrightarrow{t^o}CO_2+2H_2O\)
\(m_{CH_4}=3,6+0,2.44-0,2.32=6\left(g\right)\)
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mMg = 0,5.24 = 12 gam
VSO2 = n.22,4 = 0,25.22,4 = 5,6 lít
nN2 = \(\dfrac{16,8}{22,4}\)= 0,75 mol , nO2 = \(\dfrac{5,6}{22,4}\)= 0,25 mol
=> m(N2 + O2 ) = 0,75.28 + 0,25.32 = 29 gam
\(a,m_{NaOH}=0,25.40=10(g)\\ b,n_{CO_2}=\dfrac{2,24}{22,4}=0,1(mol)\\ m_{CO_2}=0,1.44=4,4(g)\)