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\(Fe+2HCl\rightarrow FeCl_2+H_2\\ n_{Fe}=n_{H_2}=\dfrac{9,9161}{24,79}\approx0,4\left(mol\right)\\ b,m_{Fe}\approx0,4.56\approx22,4\left(g\right)\\ c,n_{HCl}\approx0,4.2\approx0,8\left(mol\right)\\ C_{MddHCl}\approx\dfrac{0,8}{0,25}\approx3,2\left(M\right)\)
\(n_{Fe}=\dfrac{28}{56}=0,5\left(mol\right)\)
a) Pt : \(Fe+2HCl\rightarrow FeCl_2+H_2|\)
1 2 1 1
0,5 1 0,5
b) \(n_{HCl}=\dfrac{0,5.2}{1}=1\left(mol\right)\)
⇒ \(m_{HCl}=1.36,5=36,5\left(g\right)\)
c) \(n_{H2}=\dfrac{1.1}{2}=0,5\left(mol\right)\)
\(V_{H2\left(dktc\right)}=0,5.22,4=11,2\left(l\right)\)
Chúc bạn học tốt
a,\(n_{Al}=\dfrac{2,7}{27}=0,1\left(mol\right);n_{H_2SO_4}=\dfrac{29,4}{98}=0,3\left(mol\right)\)
PTHH: 2Al + 3H2SO4 → Al2(SO4)3 + 3H2
Mol: 0,1 0,15 0,05 0,15
b,Ta có: \(\dfrac{0,1}{2}< \dfrac{0,3}{3}\) ⇒ Al hết, H2SO4 dư
\(\Rightarrow m_{H_2SO_4dư}=\left(0,3-0,15\right).98=14,7\left(g\right)\)
c, \(m_{Al_2\left(SO_4\right)_3}=0,05.342=17,1\left(g\right)\)
d, \(V_{H_2}=0,15.22,4=3,36\left(l\right)\)
a) Fe + 2HCl --> FeCl2 + H2
b) mtăng = mFe - mH2
=> mH2 = 8,4 - 8,1 = 0,3 (mol)
=> \(n_{H_2}=\dfrac{0,3}{2}=0,15\left(mol\right)\)
=> VH2 = 0,15.22,4 = 3,36 (l)
c) nHCl(pư) = 0,3 (mol)
a) Fe + H2SO4 --> FeSO4 + H2
b)
\(n_{H_2SO_4}=0,3.0,6=0,18\left(mol\right)\)
PTHH: Fe + H2SO4 --> FeSO4 + H2
0,18<--0,18---->0,18-->0,18
=> \(m_{FeSO_4}=0,18.152=27,36\left(g\right)\)
c) VH2 = 0,18.22,4 = 4,032 (l)
a, \(Fe+H_2SO_4\rightarrow FeSO_4+H_2\)
b, \(n_{Fe}=\dfrac{11,2}{56}=0,2\left(mol\right)\)
Theo PT: \(n_{FeSO_4}=n_{Fe}=0,2\left(mol\right)\Rightarrow m_{FeSO_4}=0,2.152=30,4\left(g\right)\)
c, \(n_{H_2}=n_{Fe}=0,2\left(mol\right)\Rightarrow V_{H_2}=0,2.22,4=4,48\left(l\right)\)
d, \(n_{H_2SO_4}=n_{Fe}=0,2\left(mol\right)\Rightarrow C_{M_{H_2SO_4}}=\dfrac{0,2}{0,2}=1\left(M\right)\)
a) \(Fe+H_2SO_4\rightarrow FeSO_4+H_2\)
b) \(n_{H_2}=\dfrac{3,36}{22,4}=0,15\left(mol\right)\)
Theo PTHH: \(n_{Fe}=n_{H_2}=0,15\left(mol\right)\)
\(\Rightarrow m_{Fe}=0,15\cdot56=8,4\left(g\right)\)
c) Theo PTHH: \(n_{H_2SO_4}=n_{H_2}=0,15\left(mol\right)\)
\(V_{H_2SO_4}=50ml=0,05\left(l\right)\)
\(\Rightarrow C_{M,H_2SO_4}=\dfrac{n_{H_2SO_4}}{V_{H_2SO_4}}=\dfrac{0,15}{0,05}=3M\)
a, nZn = 26/65 = 0,4 (mol)
PTHH: Zn + 2HCl -> ZnCl2 + H2
nZn = nH2 = 0,4 (mol)
VH2 = 0,4 . 22,4 = 8,96 (l)
b, nFe2O3 = 16/160 = 0,1 (mol)
PTHH: Fe2O3 + 3H2 -> (t°) 2Fe + 3H2O
LTL: 0,1 < 0,4/3 => H2 dư
nFe = 0,1 . 3 = 0,3 (mol)
mFe = 0,3 . 56 = 16,8 (g)
a) \(n_{Zn}=\dfrac{26}{65}=0,4\left(mol\right)\)
PTHH: Zn + 2HCl --> ZnCl2 + H2
0,4--------------------->0,4
=> VH2 = 0,4.22,4 = 8,96 (l)
b)
\(n_{Fe_2O_3}=\dfrac{16}{160}=0,1\left(mol\right)\)
PTHH: Fe2O3 + 3H2 --to--> 2Fe + 3H2O
Xét tỉ lệ: \(\dfrac{0,1}{1}< \dfrac{0,4}{3}\) => Fe2O3 hết, H2 dư
PTHH: Fe2O3 + 3H2 --to--> 2Fe + 3H2O
0,1---------------->0,2
=> mFe = 0,2.56 = 11,2 (g)
\(n_{Fe}=\dfrac{22,4}{56}=0,4\) (mol) (1)
Phương trình hóa học :
Fe + 2HCl ---> FeCl2 + H2 (2)
Từ (1) và (2) ta có \(n_{FeCl_2}=n_{H_2}=0,4\) (mol) ; \(n_{HCl}=0,8\left(mol\right)\)
b) => \(m_{\text{muối}}=0,4.\left(56+35,5.2\right)=50.8\left(g\right)\)
c) \(V_{\text{khí}}=0,4.22,4=8,96\left(l\right)\)
d) \(m_{HCl}=0,8.36.5=29,2\left(g\right)\)
\(\Rightarrow C\%=\dfrac{29,2}{200}.100\%=14,6\%\)
\(n_{H_2SO_4}=\dfrac{200.20\%}{98}=\dfrac{20}{49}\left(mol\right)\\a, PTHH:Fe+H_2SO_4\rightarrow FeSO_4+H_2\\ n_{Fe}=n_{H_2}=n_{H_2SO_4}=\dfrac{20}{49}\left(mol\right)\\ b,m_{Fe}=\dfrac{20}{49}.56=\dfrac{160}{7}\left(g\right)\\ c,V_{H_2\left(đktc\right)}=\dfrac{20}{49}.22,4=\dfrac{64}{7}\left(l\right)\)
a, PT: \(Fe+2H_2SO_4\rightarrow FeSO_4+H_2\)
b, \(m_{H_2SO_4}=200.20\%=40\left(g\right)\Rightarrow n_{H_2SO_4}=\dfrac{40}{98}=\dfrac{20}{49}\left(mol\right)\)
Theo PT: \(n_{Fe}=n_{H_2SO_4}=\dfrac{20}{49}\left(mol\right)\Rightarrow m_{Fe}=\dfrac{20}{49}.56=\dfrac{160}{7}\left(g\right)\)
c, \(n_{H_2}=n_{H_2SO_4}=\dfrac{20}{49}\left(mol\right)\Rightarrow V_{H_2}=\dfrac{20}{49}.22,4=\dfrac{64}{7}\left(l\right)\)