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\(a.M_{Na_2CO_3}=\dfrac{106}{0,2}=530\left(g/mol\right)\)
\(b.n_{O_2}=\dfrac{5,6}{22,4}=0,25\left(mol\right)\)
\(c.n_{Cl_2}=\dfrac{7,1}{71}=0,1\left(mol\right)\)
\(\Rightarrow V_{Cl_2}=0,1.22,4=2,24\left(l\right)\)
![](https://rs.olm.vn/images/avt/0.png?1311)
\(M_{CO_2}=12+16.2=44\left(\dfrac{g}{mol}\right)\)
\(n_{CO_2}=\dfrac{m}{M}=\dfrac{44}{44}=1\left(mol\right)\)
\(V_{CO_2\left(đktc\right)}=n.22,4=1.22,4=22,4\left(l\right)\)
![](https://rs.olm.vn/images/avt/0.png?1311)
a) nCl2= 7,1/ 71=0,1(mol)
b) nCaCO3=10/100=0,1(mol)
c) nS=64/32=2(mol)
d) nAg=10,8/108=0,1(mol)
e) nCu=256/64=4(mol)
![](https://rs.olm.vn/images/avt/0.png?1311)
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: \(n_{SO_2}=\dfrac{5.6}{22.4}=0.25\left(mol\right)\)
\(m_{SO_2}=0.25\cdot\left(32+16\cdot2\right)=16\left(g\right)\)
![](https://rs.olm.vn/images/avt/0.png?1311)
1.
\(a,n_{Al}=\dfrac{5,4}{27}=0,2(mol)\\ n_{CuO}=\dfrac{8}{80}=0,1(mol)\\ n_{Fe_2O_3}=\dfrac{16}{160}=0,1(mol)\\ b,V_{CO_2}=0,25.22,4=5,6(l)\\ V_{H_2}=0,175.22,4=3,92(l)\\ V_{N_2}=1,5.22,4=33,6(l)\)
2.
\(a,n_{Al}=0,5.2=1(mol);n_{O}=0,5.3=1,5(mol)\\ \Rightarrow m_{Al}=1.27=27(g);m_{O}=1,5.16=24(g)\\ b,n_{CO_2}=\dfrac{2,2}{44}=0,05(mol)\\ \Rightarrow m_C=0,05.12=0,6(g);m_O=0,05.2.16=1,6(g)\)
![](https://rs.olm.vn/images/avt/0.png?1311)
3. a) MO2/MN2 = 32/28 = 8/7
b) MO2/MCO = 32/28 = 8/7
c) MO2/Mkk = 32/29
1 tính khối lượng của
a) 0.5 mol Fe2O3
\(M_{Fe_2O_3}=2\times56+3\times16=160\) (g/mol)
\(m_{Fe_2O_3}=n_{Fe_2O_3}\times M_{Fe_2O_3}=0,5\times112=56\left(g\right)\)
b) 0,15 mol CO2
\(M_{CO_2}=1\times12+2\times16=44\) (g/mol)
\(m_{CO_2}=n_{CO_2}\times M_{CO_2}=0,15\times44=6,6\left(g\right)\)
c) 5,6 lít O2 ( điều kiện tiêu chuẩn )
\(n_{O_2}=\frac{V_{O_2}}{22,4}=\frac{5,6}{22,4}=0,25\left(mol\right)\)
\(M_{O_2}=2\times16=32\) (g/mol)
\(m_{O_2}=n_{O_2}\times M_{O_2}=0,25\times32=8\left(g\right)\)
d) 8,96 lít H2 ( điều kiện tiêu chuẩn)
\(n_{H_2}=\frac{V_{H_2}}{22,4}=\frac{8,96}{22,4}=0,4\left(mol\right)\)
\(M_{H_2}=2\times1=2\) (g/mol)
\(m_{H_2}=n_{H_2}\times M_{H_2}=0,4\times2=0,8\left(g\right)\)
2 tính thể tích ( điều kiện tiêu chuẩn)
a) 0,125 mol Cl2
\(V_{Cl_2}=22,4\times n_{Cl_2}=22,4\times0,125=2,8\left(l\right)\)
b) 2,5 mol CH4
\(V_{CH_4}=22,4\times n_{CH_4}=22,4\times2,5=56\left(l\right)\)
c) 6,4 gam 02
\(M_{O_2}=2\times16=32\) (g/mol)
\(n_{O_2}=\frac{m_{O_2}}{M_{O_2}}=\frac{6,4}{32}=0,2\left(mol\right)\)
\(V_{O_2}=22,4\times n_{O_2}=22,4\times0,2=4,48\left(l\right)\)
d) 5,6 gam N2
\(M_{N_2}=2\times14=28\) (g/mol)
\(n_{N_2}=\frac{m_{N_2}}{M_{N_2}}=\frac{5,6}{28}=0,2\left(mol\right)\)
\(V_{N_2}=22,4\times n_{N_2}=22,4\times0,2=4,48\left(l\right)\)
3 tính tỉ khối của khí O2 so với
a) khí N2
\(d_{O_2;N_2}=\frac{M_{O_2}}{M_{N_2}}=\frac{2\times16}{2\times14}=\frac{8}{7}\)
b) khí CO
\(d_{O_2;CO}=\frac{M_{O_2}}{M_{CO}}=\frac{2\times16}{1\times12+1\times16}=\frac{8}{7}\)
c) không khí
\(d_{O_2;kk}=\frac{M_{O_2}}{M_{kk}}=\frac{2\times16}{29}=\frac{32}{29}\)
![](https://rs.olm.vn/images/avt/0.png?1311)
\(n_{CuO}=2a\left(mol\right)\Rightarrow n_{Fe_2O_3}=a\left(mol\right)\)
\(m_X=80\cdot2a+160a=80\left(g\right)\)
\(\Rightarrow a=0.25\left(mol\right)\)
\(CuO+H_2\underrightarrow{^{^{t^0}}}Cu+H_2O\)
\(Fe_2O_3+3H_2\underrightarrow{^{^{t^0}}}2Fe+3H_2O\)
\(n_{H_2}=0.5+0.25\cdot3=1.25\left(mol\right)\)
\(V_{H_2}=1.25\cdot22.4=28\left(l\right)\)
\(m_{cr}=0.5\cdot64+0.5\cdot56=60\left(g\right)\)
![](https://rs.olm.vn/images/avt/0.png?1311)
\(n_{SO_2}=\dfrac{32}{64}=0,5\left(mol\right)\\ n_{Cl_2}=\dfrac{2,24}{22,4}=0,1\left(mol\right)\\ n_{KCl}=0,1.74,5=7,45\left(g\right)\)
Bài làm
a) MCl2 = 35,5 . 2 = 71
nCl2 = m/M = 7,1/71 = 0,1 ( mol )
b) MFe2O3 = 56 . 2 + 16 . 3 = 112 + 48 = 160
nFe2O3 = m/M = 58/160 = 0,3625 ( mol )
# Học tốt #
a,n=m:M=7,1:71=0.1(mol)
b,n=m:M=58:160=0.3625(mol)