Cho 22,2g CaCl2 tác dụng với 31,8g NaCO3
Tính khối lượng các chất sau phản ứng
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\(n_{CaCl_2}=\dfrac{22.2}{111}=0.2\left(mol\right)\)
\(CaCl_2+2AgNO_3\rightarrow Ca\left(NO_3\right)_2+2AgCl\)
\(0.2....................................................0.4\)
\(m_{AgCl}=0.4\cdot143.5=57.4\left(g\right)\)
nCaCl2=22,2/111=0,2(mol)
CaCl2 + 2AgNO3 -----> 2AgCl + Ca(NO3)2
TPT:nAgCl=2.nCaCl2=2.0,2=0,4(mol)
mAgCl=0,4.143,5=57,4(g)
Bài 2:
\(a.n_{CaCl_2}=\dfrac{22,2}{111}=0,2\left(mol\right)\\ n_{AgNO_3}=\dfrac{1,7}{170}=0,01\left(mol\right)\\ CaCl_2+2AgNO_3\rightarrow Ca\left(NO_3\right)_2+2AgCl\\ a.Vì:\dfrac{0,2}{1}>\dfrac{0,01}{2}\Rightarrow CaCl_2dư\\b.n_{AgCl}=n_{AgNO_3}=0,01\left(mol\right)\\ \Rightarrow m_{\downarrow}=m_{AgCl}=143,5.0,01=1,435\left(g\right)\)
Bài 1:
\(n_{Zn}=\dfrac{13}{65}=0,2\left(mol\right)\\ n_{HCl}=0,1.3=0,3\left(mol\right)\\ Zn+2HCl\rightarrow ZnCl_2+H_2\\ a,Vì:\dfrac{0,3}{2}< \dfrac{0,2}{1}\Rightarrow Zndư\\ b.n_{ZnCl_2}=\dfrac{0,3}{2}=0,15\left(mol\right)\\ m_{ZnCl_2}=136.0,15=20,4\left(g\right)\)
-nNa2CO3= m/M = 10,6/106 = 0,1 (mol)
-PT:Na2CO3+CaCl2->CaCO3+2NaCl
____0,1____________0,1______0,2
-mCaCO3= n.M = 0,1.100 = 10 (g)
-mNaCl= n.M = 0,2.58,5 = 11,7 (g)
\(PTHH:CaCl_2+2AgNO_3\rightarrow Ca\left(NO_3\right)_2+2AgCl\downarrow\)
\(n_{CaCl_2}=\frac{22,2}{111}=0,2\left(mol\right)\)
Theo PT: \(n_{AgNO_3}=2n_{CaCl_2}=0,4\left(mol\right)\)
\(\Rightarrow m_{AgNO_3}=0,4.170=68\left(g\right)\)
b) Các chất còn lại trong phản ứng là Ca(NO3)2, AgCl
\(TheoPT:n_{Ca\left(NO_3\right)_2}=n_{CaCl_2}=0,2\left(mol\right)\)
\(n_{AgCl}=2n_{CaCl_2}=0,4\left(mol\right)\)
\(\Rightarrow m_{Ca\left(NO_3\right)_2}=0,2.164=32,8\left(g\right)\)
\(m_{AgCl}=0,4.143,5=57,4\left(g\right)\)
CaCl2 + 2AgNO3 → Ca(NO3)2 + 2AgCl
\(n_{CaCl_2}=\frac{22,2}{111}=0,2\left(mol\right)\)
a) Theo PT: \(n_{AgNO_3}=2n_{CaCl_2}=2\times0,2=0,4\left(mol\right)\)
\(\Rightarrow m_{AgNO_3}=0,4\times170=68\left(g\right)\)
b) Theo PT: \(n_{Ca\left(NO_3\right)_2}=n_{CaCl_2}=0,2\left(mol\right)\)
\(\Rightarrow m_{Ca\left(NO_3\right)_2}=0,2\times164=32,8\left(g\right)\)
Theo PT: \(n_{AgCl}=n_{AgNO_3}=0,4\left(mol\right)\)
\(\Rightarrow m_{AgCl}=0,4\times143,5=57,4\left(g\right)\)
a) Đặt nAl=a(mol) ; nFe=b(mol) (a,b>0)
nHCl= (365.12%)/36,5=1,2(mol)
PTHH: 2Al + 6 HCl -> 2AlCl3 +3 H2
a________3a_________2a____1,5a(mol)
Fe + 2 HCl -> FeCl2 + H2
b_____2b____b____b(mol)
Ta có hpt:
\(\left\{{}\begin{matrix}27a+56b=22,2\\3a+2b=1,2\end{matrix}\right.\Leftrightarrow\left\{{}\begin{matrix}a=0,2\\b=0,3\end{matrix}\right.\)
b) => %mAl= [(0,2.27)/22,2].100=24,324%
=>%mFe= 75,676%
c) mFeCl2=127. 0,3=38,1(g)
mAlCl3= 133,5. 0,2= 26,7(g)
mddsau= 22,2+365 - 1,2.2=384,8(g)
=>C%ddFeCl2= (38,1/384,8).100=9,901%
C%ddAlCl3= (26,7/384,8).100=6,939%
a, PT: \(CuO+H_2\underrightarrow{t^o}Cu+H_2O\)
Ta có: \(n_{CuO}=\dfrac{3,2}{80}=0,04\left(mol\right)\)
Theo PT: \(n_{Cu}=n_{H_2O}=n_{CuO}=0,04\left(mol\right)\)
\(\Rightarrow\left\{{}\begin{matrix}m_{Cu}=0,04.64=2,56\left(g\right)\\m_{H_2O}=0,04.18=0,72\left(g\right)\end{matrix}\right.\)
b, PT: \(Fe_3O_4+4H_2\underrightarrow{t^o}3Fe+4H_2O\)
Ta có: \(n_{Fe_3O_4}=\dfrac{10,8}{232}=\dfrac{27}{580}\left(mol\right)\)
\(n_{H_2}=\dfrac{4,48}{22,4}=0,2\left(mol\right)\)
Xét tỉ lệ: \(\dfrac{\dfrac{27}{580}}{1}< \dfrac{0,2}{4}\), ta được H2 dư.
Theo PT: \(\left\{{}\begin{matrix}n_{H_2\left(pư\right)}=n_{H_2O}=4n_{Fe_3O_4}=\dfrac{27}{145}\left(mol\right)\\n_{Fe}=3n_{Fe_3O_4}=\dfrac{81}{580}\left(mol\right)\end{matrix}\right.\)
\(\Rightarrow n_{H_2\left(dư\right)}=0,2-\dfrac{27}{145}=\dfrac{2}{145}\left(mol\right)\)
\(\Rightarrow m_{H_2\left(dư\right)}=\dfrac{2}{145}.2\approx0,0276\left(g\right)\)
\(m_{H_2O}=\dfrac{27}{145}.18\approx3,35\left(g\right)\)
\(m_{Fe}=\dfrac{81}{580}.56\approx7,82\left(g\right)\)
Bạn tham khảo nhé!
Sửa đề chút: Cho 22,2g \(CaCl_2\) tác dụng với 31,8g \(Na_2CO_3\)....
- \(n_{CaCl_2}=\dfrac{22,2}{111}=0,2\left(mol\right)\)
\(n_{Na_2CO_3}=\dfrac{31,8}{106}=0,3\left(mol\right)\)
PTHH: \(CaCl_2+Na_2CO_3\rightarrow2NaCl+CaCO_3\downarrow\)
Theo PTHH ta có tỉ lệ: \(\dfrac{0,2}{1}< \dfrac{0,3}{1}\)
=> \(Na_2CO_3\) dư. \(CaCl_2\) hết => tính theo \(n_{CaCl_2}\)
Các chất sau phản ứng gồm: \(Na_2CO_3\left(dư\right)\), \(NaCl\), \(CaCO_3\)
- Theo PT ta có: \(n_{Na_2CO_3\left(pư\right)}=n_{CaCl_2}=0,2\left(mol\right)\)
=> \(n_{Na_2CO_3\left(dư\right)}=0,3-0,2=0,1\left(mol\right)\)
=> \(m_{Na_2CO_3\left(dư\right)}=0,1.106=10,6\left(g\right)\)
- Theo PT: \(n_{NaCl}=2.n_{CaCl_2}=2.0,2=0,4\left(mol\right)\)
=> \(m_{NaCl}=0,4.58,5=23,4\left(g\right)\)
- Theo PT: \(n_{CaCO_3}=n_{CaCl_2}=0,2\left(mol\right)\)
=> \(m_{CaCO_3}=0,2.100=20\left(g\right)\)