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PTHH: \(CaCl_2+Na_2CO_3\rightarrow CaCO_3\downarrow+2NaCl\)
a+b) Ta có: \(n_{CaCl_2}=0,1\cdot2=0,2\left(mol\right)\)
\(\Rightarrow\left\{{}\begin{matrix}n_{CaCO_3}=0,2\left(mol\right)\\n_{NaCl}=0,4\left(mol\right)\end{matrix}\right.\) \(\Rightarrow\left\{{}\begin{matrix}m_{CaCO_3}=0,2\cdot100=20\left(g\right)\\C_{M_{NaCl}}=\dfrac{0,4}{0,1+0,2}\approx1,33\left(M\right)\end{matrix}\right.\)
c) PTHH: \(CaCO_3+2HCl\rightarrow CaCl_2+H_2O+CO_2\)
Theo PTHH: \(n_{HCl}=2n_{CaCO_3}=0,4\left(mol\right)\) \(\Rightarrow m_{ddHCl}=\dfrac{0,4\cdot36,5}{10\%}=146\left(g\right)\)
a.PTHH:CaCl2+Na2CO3--->CaCO3+2NaCl
Ta có:nCaCl2=0,2
=>nCaCO3=nCaCl2=0,2(mol)=>mCaCO3(kết tủa)=100.0,2=2(g)
b.Vdd=100+200=300(ml)=0,3(l)
CM Nacl=(2.0,2)/0,3=4/3(M)(Đề cho 2 chất td vừa đủ nên dd sau pứ chỉ có NaCl)
c.CaCO3+2HCl--->CaCl2+CO2+H2O
nHCl(cần dùng)=2.0.2=0,4(mol)=>mHCl=36,5.0,4=14,6(g)
=>mddHCl=14,6/10%=146(g)
a) \(n_{CO_2}=0,1\left(mol\right);n_{NaOH}=0,15\left(mol\right)\\ Tacó:\dfrac{n_{NaOH}}{n_{CO_2}}=\dfrac{0,15}{0,1}=1,5\\ \Rightarrow Xảyracácphảnứng:\\ NaOH+CO_2\rightarrow NaHCO_3\\ 2NaOH+CO_2\rightarrow Na_2CO_3+H_2O\\ Đặt:\left\{{}\begin{matrix}n_{NaHCO_3}=x\left(mol\right)\\n_{Na_2CO_3}=y\left(mol\right)\end{matrix}\right.\\ Tacó:\left\{{}\begin{matrix}x+y=0,1\left(BTNT\left(C\right)\right)\\x+2y=0,15\left(BTNT\left(Na\right)\right)\end{matrix}\right.\\ \Rightarrow\left\{{}\begin{matrix}x=0,05\\y=0,05\end{matrix}\right.\\ \Rightarrow CM_{NaHCO_3}=CM_{Na_2CO_3}=\dfrac{0,05}{0,1}=0,5M\)
b) \(NaOH+HCl\rightarrow NaCl+H_2O\\ n_{HCl}=n_{NaOH}=0,15\left(mol\right)\\ \Rightarrow V_{ddHCl}=\dfrac{0,15.36,5}{25\%}=21,9\left(g\right)\)
a. Ta có: \(n_{CO_2}=\dfrac{2,24}{22,4}=0,1\left(mol\right)\)
\(n_{NaOH}=1,5.\dfrac{100}{1000}=0,15\left(mol\right)\)
Ta có: \(T=\dfrac{n_{NaOH}}{n_{CO_2}}=\dfrac{0,15}{0,1}=1,5\left(1< 1,5< 1\right)\)
Vậy ta có PTHH:
\(CO_2+2NaOH--->Na_2CO_3+H_2O\left(1\right)\)
\(CO_2+NaOH--->NaHCO_3\left(2\right)\)
Gọi x, y lần lượt là số mol của Na2CO3 và NaHCO3.
Theo PT(1): \(n_{CO_2}=n_{Na_2CO_3}=x\left(mol\right)\)
Theo PT(1): \(n_{NaOH}=2.n_{Na_2CO_3}=2x\left(mol\right)\)
Theo PT(2): \(n_{CO_2}=n_{NaOH}=n_{NaHCO_3}=y\left(mol\right)\)
Vậy, ta có HPT:
\(\left\{{}\begin{matrix}x+y=0,1\\2x+y=0,15\end{matrix}\right.\Leftrightarrow\left\{{}\begin{matrix}x=0,05\\y=0,05\end{matrix}\right.\)
\(\Rightarrow n_{dd_{sau.PỨ}}=0,05+0,05=0,1\left(mol\right)\)
Ta có: \(V_{dd_{sau.PỨ}}=V_{dd_{NaOH}}=\dfrac{100}{1000}=0,1\left(lít\right)\)
\(\Rightarrow C_{M_{sau.PỨ}}=\dfrac{0,1}{0,1}=1M\)
b. \(PTHH:NaOH+HCl--->NaCl+H_2O\left(3\right)\)
Theo PT(3): \(n_{HCl}=n_{NaOH}=0,15\left(mol\right)\)
\(\Rightarrow m_{HCl}=0,15.36,5=5,475\left(g\right)\)
Ta có: \(C_{\%_{HCl}}=\dfrac{5,475}{m_{dd_{HCl}}}.100\%=25\%\)
\(\Leftrightarrow m_{dd_{HCl}}=21,9\left(g\right)\)
100ml = 0,1l
\(n_{H2SO4}=3.0,1=0,3\left(mol\right)\)
a) Pt : \(H_2SO_4+2KOH\rightarrow K_2SO_4+2H_2O|\)
1 2 1 2
0,3 0,6 0,3
b) \(n_{K2SO4}=\dfrac{0,3.1}{1}=0,3\left(mol\right)\)
⇒ \(m_{K2SO4}=0,3.174=52,2\left(g\right)\)
c) \(n_{KOH}=\dfrac{0,3.2}{1}=0,6\left(mol\right)\)
\(V_{ddKOH}=\dfrac{0,6}{2}=0,3\left(l\right)\)
d) \(V_{ddspu}=0,1+0,3=0,4\left(l\right)\)
\(C_{M_{K2SO4}}=\dfrac{0,3}{0,4}=0,75\left(M\right)\)
Chúc bạn học tốt
a) nNaCl=0,4.2=0,8(mol)
nAgNO3= 2.0,6=1,2(mol)
PTHH: NaCl + AgNO3 -> NaNO3 + AgCl (kết tủa)
Ta có: nNaCl(p.ứ)/nNaCl(PT) = 0,8/1 < nAgNO3(p.ứ)/nAgNO3(pt)= 1,2/1
=> P.ứ dư AgNO3, có tạo kt AgCl.
nAgCl= nNaNO3=nAgNO3(P.ứ)=nNaCl= 0,8(mol)
=> m(kết tủa)= mAgCl=0,8. 143,5= 114,8(g)
b) Vddsau= 400+600=1000(ml)=1(l)
CMddNaNO3=0,8/1=0,8(M)
CMddAgNO3(dư)= (1,2-0,8.1)/1= 0,4(M)
\(Na_2SO_3+2HCl->2NaCl+SO_2+H_2O\\ n_{Na_2SO_3}=0,1mol\\ n_{HCl}=0,3mol\\ \Rightarrow HCl:dư\\ C_{M\left(HCl\right)}=\dfrac{0,1}{0,2}=0,5M\\ C_{M\left(NaCl\right)}=\dfrac{0,2}{0,2}=1M\)