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Ta có: \(\left\{{}\begin{matrix}n_{H_2}=\dfrac{3,36}{22,4}=0,15\left(mol\right)\\n_{SO_2}=\dfrac{6,72}{22,4}=0,3\left(mol\right)\end{matrix}\right.\)
PTHH: \(2Al+6HCl\rightarrow2AlCl_3+3H_2\uparrow\)
0,1____0,3_____0,1_____0,15 (mol)
\(2Al+6H_2SO_{4\left(đ\right)}\xrightarrow[]{t^o}Al_2\left(SO_4\right)_3+3SO_2\uparrow+6H_2O\)
0,1______0,3__________0,05____0,15_____0,3 (mol)
\(Cu+2H_2SO_{4\left(đ\right)}\xrightarrow[]{t^o}CuSO_4+SO_2\uparrow+2H_2O\)
0,15_____0,3________0,15___0,15_____0,3 (mol)
Ta có: \(m_{Al}+m_{Cu}=0,1\cdot27+0,15\cdot64=12,3\left(g\right)\)
Bài 7:
PTHH: \(Mg+H_2SO_4\rightarrow MgSO_4+H_2\uparrow\)
Ta có: \(n_{H_2SO_4}=0,2\cdot1=0,2\left(mol\right)=n_{Mg}=n_{H_2}=n_{MgSO_4}\)
\(\Rightarrow\left\{{}\begin{matrix}m_{Ag}=15,6-0,2\cdot24=10,8\left(g\right)\\V_{H_2}=0,2\cdot22,4=2,24\left(l\right)\\C_{M_{MgSO_4}}=\dfrac{0,2}{0,2}=1\left(M\right)\end{matrix}\right.\)
a, PT: \(Zn+H_2SO_4\rightarrow ZnSO_4+H_2\)
b, Ta có: \(n_{H_2}=\dfrac{3,36}{22,4}=0,15\left(mol\right)\)
Theo PT: \(n_{Zn}=n_{H_2}=0,15\left(mol\right)\)
\(\Rightarrow m_{Zn}=0,15.65=9,75\left(g\right)\)
\(\Rightarrow m_{Cu}=m_{hh}-m_{Zn}=21-9,75=11,25\left(g\right)\)
\(A:Fe_2O_3\\ B:FeCl_3\\ C:Fe(NO_3)_3\\ D:Fe_2(SO_4)_3\\ E:Na_2SO_4\\ F:NaOH\)
Từ đó ta có các PTHH tương ứng là:
\((1)Fe(OH)_3\xrightarrow{t^o}Fe_2O_3+3H_2O\\ (2)Fe_2O_3+6HCl\to 2FeCl_3+3H_2O\\ (3)FeCl_3+3AgNO_3\to Fe(NO_3)_3+3AgCl\downarrow\\ (4)Fe_2(SO_4)_3+6NaOH\to 2Fe(OH)_3\downarrow+3Na_2SO_4\\ (5)Na_2SO_4+Ba(OH)_2\to BaSO_4\downarrow+2NaOH\\ (6)FeCl_3+3NaOH\to Fe(OH)_3+3NaCl\\ (7)\begin{cases} Fe(NO_3)_3+3NaOH\to Fe(OH)_3\downarrow+3NaNO_3\\ NaOH+FeCl_3\to Fe(OH)_3+3NaCl \end{cases}\)
BT1:
(1) Ca(OH)2 + CO2 ---> CaCO3↓ + H2O
(2) CaCO3 ---to---> CaO + CO2.
(3) CaO + 2HCl ---> CaCl2 + H2O
(4) CaCO3 + HCl ---> CaCl2 + CO2 + H2O.
(4) CaCO3 + 2HCl ---> CaCl2 + CO2 + H2O