Hãy nhập câu hỏi của bạn vào đây, nếu là tài khoản VIP, bạn sẽ được ưu tiên trả lời.
nCO2=0,2mol
PTHH: 2HCl+CaCO3=>CaCl2+CO2+H2O
0,4mol<-0,2mol<-0,2mol<-0,2mol->0,2mol
=> mHCl tham gia : 0,4.36,5=14,6g
=> C%HCl=14,6:100.100=14,6%
b)mCaCO3 tham gia : 0,2.100=20g
c) m muối thu được :0,2.111=22,2g
theo định luật btoan khối lượng ta có : m(CaCl2)=mHCl+mCaCO3-mCO2-mH2o
=100+20-0,2.44-0,1.18=109,4
=> C% muối: 22,2/109,4.100=20,29%
nCaCO3 = \(\dfrac{m}{M}\)=\(\dfrac{10}{100}\)= 0,1 (mol)
a. PTHH:
CaCO3 + 2HCl → CaCl2 + CO2 + H2O
1 : 2 : 1 : 1 : 1 (mol)
0,1 : 0,2 : 0,1 : 0,1 : 0,1 (mol)
b. mHCl = n.M = 0,2.36,5 = 7,3 (g)
mdd HCl = \(\dfrac{m_{ct}.100\%}{C\%}\)=\(\dfrac{7,3.100}{10}\)= 73 (g)
mdd (pư) = 10 + 73 = 83 (g)
c. VCO2 (đktc) = n.22,4 = 0,1.22,4 = 2,24 (l)
d. mCaCl2 = n.M = 0,1.111 = 11,1 (g)
mdd (sau pư) = mdd (pư) - mCO2 = 83 + (0,1.44) = 87,4 (g)
C% = \(\dfrac{m_{ct}}{m_{dd}}\).100% = \(\dfrac{11,1}{87,4}\).100% = 12,7%
a) PTHH: CaCO3 + 2HCl → CaCl2 + CO2↑ + H2O
b) \(n_{CaCO_3}=\dfrac{10}{100}=0,1\left(mol\right)\)
Theo PT: \(n_{HCl}=2n_{CaCO_3}=2\times0,1=0,2\left(mol\right)\)
\(\Rightarrow m_{HCl}=0,2\times36,5=7,3\left(g\right)\)
\(\Rightarrow m_{ddHCl}=\dfrac{7,3\times100\%}{10\%}=73\left(g\right)\)
c) Theo PT: \(n_{CO_2}=n_{CaCO_3}=0,1\left(mol\right)\)
\(\Rightarrow V_{CO_2}=0,1\times22,4=2,24\left(l\right)\)
\(m_{CO_2}=0,1\times44=4,4\left(g\right)\)
d) Theo PT: \(n_{CaCl_2}=n_{CaCO_3}=0,1\left(mol\right)\)
\(\Rightarrow m_{CaCl_2}=0,1\times111=11,1\left(g\right)\)
\(m_{dd}=10+73-4,4=78,6\left(g\right)\)
\(\Rightarrow C\%_{CaCl_2}=\dfrac{11,1}{78,6}\times100\%=14,12\%\)
Bài1:
nCO2= 1.344/22.4=0.06(mol)
nCa(OH)2=1×0.5=0.5(mol)
a)CO2+Ca(OH)2 ->CaCO3+ H2O
nCaCO3=0.06(mol)
b)mCaCO3= 0.06×100=6(g)
ZnO+ 2HCl----->ZnCl2+H2O
Al2O3+6HCl------->2AlCl3+3H2O
nHCl=2.0,25=0,5 mol
Gọi nZnO=x, nAl2O3=y
---->nZnO=2nHCl=2x mol
------>nAl2O3=6nHCl=6y mol
ta có hệ phương trình 81x+102y=13,2
2x+6y=0,5
-----x=0,1 mol,y=0,05 mol
mZnO=0,1.81=8,1 g
---->%mZnO=8,1.100/13,2=61,36%
%mAl2O3=100-61,36=38,64%
nZnO=nZnCl2=0,1 mol
mZnCl2=0,1.136=13,6 g
nAl2O3=2nAlCl3=0,1 mol
mAlCl3=0,1.133,5=13,35g
a, PT: \(CaCO_3+2HCl\rightarrow CaCl_2+CO_2+H_2O\)
\(MgCO_3+2HCl\rightarrow MgCl_2+CO_2+H_2O\)
Ta có: 100nCaCO3 + 84nMgCO3 = 14,2 (1)
Theo PT: \(n_{CO_2}=n_{CaCO_3}+n_{MgCO_3}=\dfrac{3,36}{22,4}=0,15\left(mol\right)\left(2\right)\)
Từ (1) và (2) \(\Rightarrow\left\{{}\begin{matrix}n_{CaCO_3}=0,1\left(mol\right)\\n_{MgCO_3}=0,05\left(mol\right)\end{matrix}\right.\)
\(\Rightarrow\left\{{}\begin{matrix}\%m_{CaCO_3}=\dfrac{0,1.100}{14,2}.100\%\approx70,42\%\\\%m_{MgCO_3}\approx29,58\%\end{matrix}\right.\)
b, Theo PT: \(n_{HCl}=2n_{CO_2}=0,3\left(mol\right)\Rightarrow C_{M_{HCl}}=\dfrac{0,3}{0,6}=0,5\left(M\right)\)
PTHH :
\(CaCO_3+2HCl\rightarrow CaCl_2+H_2O+CO_2\)
x 2x x x x
\(MgCO_3+2HCl\rightarrow MgCl_2+H_2O+CO_2\uparrow\)
y 2y y y y
Có:
\(\left\{{}\begin{matrix}100x+84y=14,2\\x+y=\dfrac{3,36}{22,4}=0,15\end{matrix}\right.\)
\(\Rightarrow x=0,1;y=0,05\)
\(a,\%m_{CaCO_3}=0,1.100:14,2.100\%\approx72,423\%\)
\(\%m_{MgCO_3}=100\%-72,423\%\approx29,577\%\)
\(b,C_{M\left(HCl\right)}=\dfrac{0,2+0,1}{0,6}=0,5\left(M\right)\)
a, PTHH : \(CaCO_3+2HCl\rightarrow CaCl_2+H_2O+CO_2\)
\(n_{CaCO_3}=\frac{m}{M}=\frac{10}{100}=0,1\left(mol\right)\)
\(n_{HCl}=C_M.V=2.0,02=0,04\left(mol\right)\)
- Theo PTHH : \(n_{CaCO_3}=\frac{1}{2}n_{HCl}=0,04.\frac{1}{2}=0,02\left(mol\right)\)
=> Sau phản ứng CaCO3 còn dư ( dư \(0,1-0,02=0,08\left(mol\right)\) ), HCl phản ứng hết .
- Theo PTHH : \(n_{CO_2}=\frac{1}{2}n_{HCl}=\frac{1}{2}.0,04=0,02\left(mol\right)\)
=> \(V_{CO_2}=n.22,4=0,02.22,4=0,448\left(l\right)\)
b, - Theo PTHH : \(n_{CaCl_2}=\frac{1}{2}n_{HCl}=\frac{1}{2}0,04=0,02\left(mol\right)\)
=> \(\left\{{}\begin{matrix}C_{MCaCl_2}=\frac{n}{V}=\frac{0,02}{0,02}=1\left(M\right)\\C_{MCaCO_3}=\frac{n}{V}=\frac{0,08}{0,02}=4\left(M\right)\end{matrix}\right.\)