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a, \(Na_2CO_3+2HCl\rightarrow2NaCl+CO_2+H_2O\)
b,\(n_{Na_2CO_3}=\dfrac{21,2}{106}=0,2\left(mol\right)\)
Theo PT: \(n_{HCl}=2n_{Na_2CO_3}=0,4\left(mol\right)\)
\(\Rightarrow m_{HCl}=0,4.36,5=14,6\left(g\right)\)
c, \(n_{CO_2}=n_{Na_2CO_3}=0,2\left(mol\right)\)
\(\Rightarrow V_{CO_2}=0,2.22,4=4,48\left(l\right)\)
Ta có: \(n_K=\dfrac{7,8}{39}=0,2\left(mol\right)\)
a, PT: \(2K+2CH_3COOH\rightarrow2CH_3COOK+H_2\)
_____0,2______0,2_____________________0,1 (mol)
b, \(m_{CH_3COOH}=0,2.60=12\left(g\right)\)
c, \(V_{H_2}=0,1.22,4=2,24\left(l\right)\)
Bạn tham khảo nhé!
$a\big)$
$n_{Na}=\dfrac{4,6}{23}=0,2(mol)$
$CH_3COOH+Na\to CH_3COONa+\dfrac{1}{2}H_2$
Theo PT: $n_{CH_3COOH}=n_{Na}=0,2(mol)$
$\to m_{CH_3COOH}=0,2.60=12(g)$
$b\big)$
Theo PT: $n_{H_2}=\dfrac{1}{2}n_{Na}=0,1(mol)$
$\to V_{H_2(đktc)}=0,1.22,4=2,24(l)$
\(n_{Zn}=\dfrac{3,9}{65}=0,06mol\)
\(Zn+2HCl\rightarrow ZnCl_2+H_2\uparrow\)
0,06 0,12 0,06 0,06
\(V_{H_2}=0,06\cdot22,4=1,344l\)
\(d_{H_2}\)/CO2=\(\dfrac{M_{H_2}}{M_{CO_2}}=\dfrac{2}{44}=\dfrac{1}{22}\)
\(m_{HCl}=0,12\cdot36,5=4,38g\)
\(m_{ZnCl_2}=0,06\cdot136=8,16g\)
a) Zn + 2HCl ---> ZnCl2 + H2
b) nZn = 3,9:65= 0,06 ( mol)
theo pt , nH2 =nZn= 0,06 (mol)
=> VH2(ĐKTC) = 0,06.22,4=1,344(l)
H2/CO2 = MH2/MCO2 =2/44=1/22
c) theo pt nHCl = 2nZn = 2.0,06=0,12(mol)
=> mHCl= 0,12 . 36,5=4,38(g)
d) theo pt , nZnCl2= nZn = 0,06(mol)
=> m ZnCl2 = 0,06.136=8,16 (g)
\(a,PTHH:Zn+2HCl\rightarrow ZnCl_2+H_2\)
\(b,n_{Zn}=\dfrac{m}{M}=\dfrac{16,25}{65}=0,25\left(mol\right)\\ Theo.PTHH:n_{HCl}=2.n_{Zn}=2.0,25=0,5\left(mol\right)\\ m_{HCl}=n.M=0,5.36,5=18,25\left(g\right)\)
\(Theo.PTHH:n_{H_2}=n_{Zn}=0,25\left(mol\right)\\ V_{H_2\left(đktc\right)}=n.22,4=0,25.22,4=5,6\left(l\right)\)
a)PTHH: \(Zn+2HCl\rightarrow ZnCl_2+H_2\)
b)Khối lượng Zn:\(m_{Zn}=\dfrac{16,25}{65}=0,25\left(mol\right)\)
Ta có: \(n_{HCl}=2n_{Zn}=0,5\left(mol\right)\)
Khối lượng axit HCl cần dùng là: \(m_{HCl}=0,5.36,5=18,25\left(g\right)\)
c)Theo pt ta có: \(n_{H_2}=n_{Zn}=0,25\left(mol\right)\)
Thể tích H2 là: \(V_{H_2}=n.22,4=0,25.22,4=5,6\left(ml\right)\)
a) Zn + 2HCl --> ZnCl2 + H2
b) \(n_{Zn}=\dfrac{1,3}{65}=0,02\left(mol\right)\)
PTHH: Zn + 2HCl --> ZnCl2 + H2
0,02-->0,04---------->0,02
=> VH2 = 0,02.22,4 = 0,448 (l)
c) mHCl = 0,04.36,5 = 1,46 (g)
a. PTHH: Fe + 2HCl ---> FeCl2 + H2 (1)
b, \(n_{Fe}=\dfrac{11,2}{56}=0,2\left(mol\right)\)
Theo pthh (1): \(n_{H_2}=n_{Fe}=0,2\left(mol\right)\)
\(\rightarrow V_{H_2}=0,2.22,4=4,48\left(l\right)\)
c, PTHH: 2H2 + O2 --to--> 2H2O (2)
Theo pthh (2): \(n_{O_2}=\dfrac{1}{2}n_{H_2}=\dfrac{1}{2}.0,2=0,1\left(mol\right)\)
\(\rightarrow m_{O_2}=0,1.32=3,2\left(g\right)\)
a) PTHH: \(Zn+2HCl\rightarrow ZnCl_2+H_2\uparrow\)
b+c) Ta có: \(n_{Zn}=\dfrac{6,5}{65}=0,1\left(mol\right)\)
\(\Rightarrow\left\{{}\begin{matrix}n_{HCl}=0,2\left(mol\right)\\n_{H_2}=0,1\left(mol\right)\end{matrix}\right.\) \(\Rightarrow\left\{{}\begin{matrix}m_{HCl}=0,2\cdot36,5=7,3\left(g\right)\\V_{H_2}=0,1\cdot22,4=2,24\left(l\right)\end{matrix}\right.\)