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CuO+2HCl->Cucl2+H2O
0,2----------------0,2
n CuO=0,2 mol
=>m CuCl2=0,2.135=27g
\(Na+HCl \to NaCl+\frac{1}{2}H_2\\ n_{Na}=2n_{H_2}=2.0,4=0,8(mol)\\ m_{Na}=0,8.23=18,4(g)\)
$n_{CaO} = \dfrac{5,6}{56} =0,1(mol)$
$CaO + 2HCl \to CaCl_2 + H_2O$
Theo PTHH :
$n_{HCl} = 2n_{CaO} = 0,2(mol) \Rightarrow m_{dd\ HCl} = \dfrac{0,2.36,5}{14,6\%} = 50(gam)$
nCaO=0,1(mol)
PTHH: CaO + 2 HCl -> CaCl2 + H2O
nHCl=2.0,1=0,2(mol) => mHCl=0,2.36,5=7,3(g)
=>mddHCl=(7,3.100)/14,6=50(g)
a) $CaSO_3 + 2HCl \to CaCl_2 + SO_2 + H_2O$
b)
$n_{SO_2} = n_{CaSO_3} = \dfrac{12}{120} = 0,1(mol)$
$m_{SO_2} = 0,1.64 = 6,4(gam)$
c)
$n_{HCl} = 2n_{SO_2} = 0,2(mol)$
$\Rightarrow m_{dd\ HCl} = \dfrac{0,2.36,5}{14,6\%} = 50(gam)$
d)
$m_{dd\ sau\ pư} = m_{CaSO_3} + m_{dd\ HCl} - m_{SO_2} = 12 + 50 - 6,4 = 55,6(gam)$
$C\%_{CaCl_2} = \dfrac{0,1.111}{55,6}.100\% = 19,96\%$
Ta có: \(n_{CaSO_3}=\dfrac{12}{120}=0,1\left(mol\right)\)
a. PTHH: CaSO3 + 2HCl ---> CaCl2 + H2O + SO2
b. Theo PT: \(n_{SO_2}=n_{CaSO_3}=0,1\left(mol\right)\)
=> \(m_{SO_2}=0,1.64=6,4\left(g\right)\)
c. Theo PT: \(n_{HCl}=2.n_{CaSO_3}=2.0,1=0,2\left(mol\right)\)
=> \(m_{HCl}=0,2.36,5=7,3\left(g\right)\)
Ta có: \(C_{\%_{HCl}}=\dfrac{7,3}{m_{dd_{HCl}}}.100\%=14,6\%\)
=> \(m_{dd_{HCl}}=50\left(g\right)\)
d. Ta có: \(m_{dd_{CaCl_2}}=12+50-0,1.64=55,6\left(g\right)\)
Theo PT: \(n_{CaCl_2}=n_{SO_2}=0,1\left(mol\right)\)
=> \(m_{CaCl_2}=0,1.111=11,1\left(g\right)\)
=> \(C_{\%_{CaCl_2}}=\dfrac{11,1}{55,6}.100\%=19,96\%\)
\(Fe+2HCl\rightarrow FeCl_2+H_2\\ 2Al+6HCl\rightarrow2AlCl_3+3H_2\\ Đặt:\left\{{}\begin{matrix}n_{Fe}=x\left(mol\right)\\n_{Al}=y\left(mol\right)\end{matrix}\right.\\ \Rightarrow\left\{{}\begin{matrix}56x+27y=2,78\\x+1,5y=0,07\end{matrix}\right.\\ \Rightarrow\left\{{}\begin{matrix}x=0,04\\y=0,02\end{matrix}\right.\\ n_{FeCl_2}=n_{Fe}=0,04\left(mol\right)\\ \Rightarrow m_{FeCl_2}=0,04.127=5,08\left(g\right)\)
\(n_{CH_4}=\dfrac{11,2}{22,4}=0,5\left(mol\right)\)
PTHH: CH4 + 2O2 --to--> CO2 + 2H2O
0,5--------------->0,5
CO2 + Ca(OH)2 --> CaCO3 + H2O
0,5------------------->0,5
=> mCaCO3 = 0,5.100 = 50 (g)
=> B
\(n_{CaO}=\dfrac{5,6}{56}=0.1\left(mol\right)\\ CaO+2HCl->CaCl_2+H_2O\\ =>n_{HCl}=0,2\left(mol\right)\\ m_{HCl}=0,2\cdot36.5=7.3\left(g\right)\\ m_{ddHCl}=\dfrac{7,3\cdot100}{14.6}=50\left(g\right)\)
Chọn đáp án A
thank bạn