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`a)PTHH: Zn + 2HCl -> ZnCl_2 + H_2↑`
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`b) n_[Zn] = [ 6,5 ] / 65 = 0,1 (mol)`
Theo `PTHH` có: `n_[H_2] = n_[Zn] = 0,1 (mol)`
`-> V_[H_2 (đktc)] = 0,1 . 22,4 = 2,24 (l)`
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`c)` Theo `PTHH` có: `n_[HCl] = 2 n_[Zn] = 2 . 0,1 = 0,2 (mol)`
Đổi `200 ml = 0,2 l`
`-> C_[M_[HCl]] = [ 0,2 ] / [0,2 ] = 1(M)`
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`d)` Theo `PTHH` có: `n_[ZnCl_2] = n_[Zn] = 0,1 (mol)`
`-> m_[ZnCl_2] = 0,1 . 136 = 13,6 (g)`
VHCl= 200ml = 0,2 (l)
Zn + 2HCl -- > ZnCl2 + H2
nZn = 6,5 : 65 = 0,1(mol)
VH2 = 0,1 . 22,4 = 2,24 (l)
\(C_{MHCl}=\dfrac{n}{V}=\dfrac{0,2}{0,2}=1M\)
mZnCl2 = 0,1 . 136 = 13,6 (g)
a)
PTHH: Mg + 2HCl --> MgCl2 + H2
0,075<--0,15--->0,075-->0,075
=> m = 0,075.24 = 1,8 (g)
b) VH2 = 0,075.22,4 = 1,68 (l)
c) mMgCl2 = 0,075.95 = 7,125 (g)
d)
PTHH: 2H2 + O2 --to--> 2H2O
0,075->0,0375
=> VO2 = 0,0375.22,4 = 0,84 (l)
a.b.c.
\(Mg+2HCl\rightarrow MgCl_2+H_2\)
0,075 0,15 0,075 0,075 ( mol )
\(m_{Mg}=0,075.24=1,8g\)
\(V_{H_2}=0,075.22,4=1,68l\)
\(m_{MgCl_2}=0,075.95=7,125g\)
d.\(2H_2+O_2\rightarrow\left(t^o\right)2H_2O\)
0,075 0,0375 ( mol )
\(V_{O_2}=0,0375.22,4=0,84l\)
nFe = 2,8 : 56 = 0,05 ( mol )
PTHH : Fe + 2HCl -----> FeCl2 + H2
mol 0,05 0,1 0,05
VH2 = 0,05 x 22,4 = 1,12 ( l )
mHCl = 0,1 x 36,5 = 3,65 ( g)
=> mHCl (10%) = 3,65 x 100 : 10 = 36,5 (g)
PTHH
Fe + 2HCl \(\rightarrow\) Fe + H2O
gt 0,05 0,1 0,05 0,05
mFe = 2,8 g \(\Rightarrow\) nFe = \(\frac{m}{M}\)= \(\frac{2,8}{56}=0,05\left(mol\right)\)
Theo ptpư + gt ta có:
V\(H_2\) = n. 22,4 = 0,05 . 22,4 = 1,12 (lít)
mHCl = 0,1 . 36,5 = 3, 65 (g)
mdd HCl = \(\frac{3,65.100}{10}=36,5\left(g\right)\)
câu 1
\(n_{Fe}=\dfrac{14}{56}=0,25\left(mol\right)\\ pthh:Fe+2HCl\rightarrow FeCl_2+H_2\)
0,25 0,5 0,25 0,25
\(m_{FeCl_2}=0,25.127=31,75g\\
V_{H_2}=0,25.22,4=5,6\\
C_{M\left(HCl\right)}=\dfrac{0,5}{0,2}=2,5M\)
câu 2
1 ) \(m_{\text{dd}}=35+100=135g\\
2,C\%=\dfrac{204}{204+100}.100=60\%\\
=>m\text{dd}=\dfrac{100.204}{60}=340g\)
a, PT: \(Mg+2HCl\rightarrow MgCl_2+H_2\)
Ta có: \(n_{Mg}=\dfrac{4,8}{24}=0,2\left(mol\right)\)
b, Theo PT: \(n_{H_2}=n_{Mg}=0,2\left(mol\right)\)
\(\Rightarrow V_{H_2}=0,2.24,79=4,958\left(l\right)\)
c, Theo PT: \(n_{MgCl_2}=n_{Mg}=0,2\left(mol\right)\)
\(\Rightarrow m_{MgCl_2}=0,2.95=19\left(g\right)\)
a)
\(Zn + 2HCl \to ZnCl_2 + H_2\\ n_{ZnCl_2} = n_{H_2} = n_{Zn} = \dfrac{19,5}{65} =0,3(mol)\\ V_{H_2} = 0,3.22,4 = 6,72(lít)\\ b) m_{ZnCl_2} = 0,3.136 = 40,8(gam)\\ c) n_{HCl} = 2n_{Zn} = 0,6(mol) \Rightarrow V_{dd\ HCl} = \dfrac{0,6}{2} = 0,3(lít)\\ d) 2H_2 + O_2 \xrightarrow{t^o} 2H_2O\\ V_{O_2} = \dfrac{1}{2} V_{H_2} = 3,36(lít)\\ V_{không\ khí} = \dfrac{V_{O_2}}{20\%}= \dfrac{3,36}{20\%} = 16,8(lít)\)
Ta có: \(n_{Mg}=\dfrac{2,4}{24}=0,1\left(mol\right)\)
PT: \(Mg+2HCl\rightarrow MgCl_2+H_2\)
Theo PT: \(n_{MgCl_2}=n_{H_2}=n_{Mg}=0,1\left(mol\right)\)
a, \(m_{MgCl_2}=0,1.95=9,5\left(g\right)\)
b, \(V_{H_2}=0,1.24,79=2,479\left(l\right)\)
c, \(n_{HCl}=2n_{Mg}=0,2\left(mol\right)\)
\(\Rightarrow m_{ddHCl}=\dfrac{0,2.36,5}{3,65\%}=200\left(g\right)\)
a, \(n_{Mg}=\dfrac{4,8}{24}=0,2\left(mol\right)\)
PTHH: Mg + 2HCl ---> MgCl2 + H2
0,2-->0,4-------->0,2---->0,2
\(\Rightarrow\left\{{}\begin{matrix}b,V_{H_2}=0,2.22,4=4,48\left(l\right)\\c,V_{ddHCl}=\dfrac{0,4}{2}=0,2\left(l\right)\\d,m_{MgCl_2}=0,2.95=19\left(g\right)\end{matrix}\right.\)
\(n_{Mg}=\dfrac{4,8}{24}=0,2mol\)
\(Mg+2HCl\rightarrow MgCl_2+H_2\)
0,2 0,4 0,2 0,2 ( mol )
\(V_{H_2}=0,2.22,4=4,48l\)
\(V_{HCl}=\dfrac{0,4}{2}=0,2l\)
\(m_{ZnCl_2}=0,2.95=19g\)