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a) PTHH: \(Zn+H_2SO_4\rightarrow ZnSO_4+H_2\uparrow\) (1)
\(ZnO+H_2SO_4\rightarrow ZnSO_4+H_2O\) (2)
b) Ta có: \(\left\{{}\begin{matrix}n_{H_2}=\dfrac{2,24}{22,4}=0,1\left(mol\right)\\\Sigma n_{H_2SO_4}=0,2\cdot1=0,2\left(mol\right)\end{matrix}\right.\)
\(\Rightarrow n_{Zn}=n_{ZnO}=n_{H_2SO_4\left(1\right)}=n_{H_2SO_4\left(2\right)}=0,1\left(mol\right)\)
\(\Rightarrow\left\{{}\begin{matrix}m_{Zn}=0,1\cdot65=6,5\left(g\right)\\m_{ZnO}=0,1\cdot81=8,1\left(g\right)\end{matrix}\right.\)
c) Theo các PTHH: \(\left\{{}\begin{matrix}n_{Zn}=n_{ZnSO_4\left(1\right)}=0,1mol\\n_{ZnO}=n_{ZnSO_4\left(2\right)}=0,1mol\end{matrix}\right.\)
\(\Rightarrow\Sigma n_{ZnSO_4}=0,2mol\) \(\Rightarrow C_{M_{ZnSO_4}}=\dfrac{0,2}{0,2}=1\left(M\right)\)
(Coi như thể tích dd thay đổi không đáng kể)
a) PTHH: Fe + 2 HCl -> FeCl2 + H2
nH2= 0,1(mol)
-> nFe= nFeCl2=nH2=0,1(mol)
=>mFeCl2=127.0,1=12,7(g)
PTHH: Fe2O3+ 6 HCl -> 2 FeCl3 + 3 H2O
mFeCl3= m(hỗn hợp muối)- mFeCl2= 45,2- 12,7= 32,5(g)
b) => nFeCl3= 0,2(mol)
=> nFe2O3= nFeCl3/2= 0,2/2= 0,1(mol)
=> m(hỗn hợp ban đầu)= mFe+ mFe2O3= 0,1. 56+ 0,1.160=21,6(g)
a) PTHH: Fe + 2 HCl -> FeCl2 + H2
nH2= 0,1(mol)
-> nFe= nFeCl2=nH2=0,1(mol)
=>mFeCl2=127.0,1=12,7(g)
PTHH: Fe2O3+ 6 HCl -> 2 FeCl3 + 3 H2O
mFeCl3= m(hỗn hợp muối)- mFeCl2= 45,2- 12,7= 32,5(g)
b) => nFeCl3= 0,2(mol)
=> nFe2O3= nFeCl3/2= 0,2/2= 0,1(mol)
=> m(hỗn hợp ban đầu)= mFe+ mFe2O3= 0,1. 56+ 0,1.160=21,6(g)
\(M+H_2SO_4\rightarrow MSO_4+H_2\)
\(MO+H_2SO_{4_{ }}\rightarrow MSO_4+H_2O\)
a)\(n_{H_2}=\dfrac{2,24}{22,4}=0,1\left(mol\right)\)=>\(n_M=0,1\left(mol\right)\left(TheoPTHH\right)\)
\(n_{MO}=n_M.1,5=0,15\left(mol\right)\)
Theo PTHH ta có
\(n_{MSO_4}=n_M+n_{MO}=0,1+0,15=0,25\left(mol\right)\)
Ta lại có
\(m_{MSO_4}=0,25.\left(M+96\right)=34\left(g\right)\)
=>M=40 nên M là Ca CT oxit CaO
b)\(m_{Ca}=0,1.40=4\left(g\right)\) \(m_{CaO}=0,15.56=8,4\left(g\right)\)
a)
$CaCO_3+ 2HCl \to CaCl_2 + CO_2 + H_2O$
$n_{CaCO_3} = n_{CO_2} = \dfrac{2,24}{22,4} = 0,1(mol)$
$m_{CaCO_3} = 0,1.100 = 10(gam)$
$m_{CaO} = 21,2 - 10 = 11,2(gam)$
b)
$CO_2 + Ca(OH)_2 \to CaCO_3 + H_2O$
$n_{CaCO_3} = n_{CO_2} = 0,1(mol)$
$m_{kết\ tủa} = 0,1.100 = 10(gam)$
a) \(2Al+6HCl\rightarrow2AlCl_3+3H_2\left(1\right)\\ Fe+2HCl\rightarrow FeCl_2+H_2\left(2\right)\\ 2Al+2NaOH+2H_2O\rightarrow2NaAlO_2+3H_2\)
Cho hỗn hợp tác dụng với NaOH, chất rắn không tan là Fe
=> mFe= 1,12 (g) \(\Rightarrow n_{Fe}=0,02\left(mol\right)\)
Ta có: \(n_{H_2\left(2\right)}=n_{Fe}=0,02\left(mol\right)\)
=> \(n_{H_2\left(1\right)}=\Sigma n_{H_2}-n_{H_2\left(2\right)}=0,065-0,02=0,045\left(mol\right)\)
\(\Rightarrow n_{Al}=\dfrac{2}{3}n_{H_2\left(1\right)}=0,03\left(mol\right)\)
\(\Rightarrow m_{Al}=0,03.27=0,81\left(g\right)\)
\(\Rightarrow\%m_{Al}=41,97\%,\%m_{Fe}=58,03\%\)
b) \(m_{FeCl_2}=0,02.127=2,54\left(g\right)\\ m_{AlCl_3}=0,03.133,5=4,005\left(g\right)\)
Gọi \(\left\{{}\begin{matrix}n_{CH_3COOH}=a\left(mol\right)\\n_{C_2H_5OH}=b\left(mol\right)\end{matrix}\right.\)
\(n_{H_2}=\dfrac{2,24}{22,4}=0,1\left(mol\right)\)
PTHH:
2CH3COOH + 2Na ---> 2CH3COONa + H2
a -----------------------------------------------> 0,5a
2C2H5OH + 2Na ---> 2C2H5ONa + H2
b ------------------------------------------> 0,5b
Hệ pt \(\left\{{}\begin{matrix}60a+46b=10,6\\0,5a+0,5b=0,1\end{matrix}\right.\Leftrightarrow a=b=0,1\left(mol\right)\)
\(\rightarrow\left\{{}\begin{matrix}m_{CH_3COOH}=60.0,1=6\left(g\right)\\m_{C_2H_5OH}=0,1.46=4,6\left(g\right)\end{matrix}\right.\)
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