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CaCO3+2HCl\(\rightarrow\)CaCl2+CO2+H2O
CaCO3+H2SO4\(\rightarrow\)CaSO4+CO2+H2O
\(n_{CO_2}=\dfrac{5,6}{22,4}=0,25mol\)
Gọi x, y lần lượt là số mol CaCl2 và CaSO4.Ta có hệ:
x+y=0,25
111x+136y=32,7
Giải ra x=0,052, y=0,198
Số mol HCl=x=0,052mol
\(C_{M_{HCl}}=\dfrac{0,052}{0,1}=0,52M\)
Số mol H2SO4=y=0,198mol
\(C_{M_{H_2SO_4}}=\dfrac{0,198}{0,1}=1,98M\)
\(m_{CaCO_3}=\left(0,052+0,198\right).100=25g\)
\(n_{khí}=\dfrac{11.2}{22.4}=0.5\left(mol\right)\)
\(n_{CaCO_3}=a\left(mol\right)\)
\(n_{K_2SO_3}=b\left(mol\right)\)
\(\Rightarrow m_{hh}=100a+158b=70.3\left(g\right)\left(1\right)\)
\(CaCO_3+2HCl\rightarrow CaCl_2+CO_2+H_2O\)
\(K_2SO_3+2HCl\rightarrow2KCl+SO_2+H_2O\)
\(n_{khí}=a+b=0.5\left(mol\right)\left(2\right)\)
\(\left(1\right),\left(2\right):a=0.15,b=0.35\)
\(m_{Muối}=m_{CaCl_2}+m_{KCl}=0.15\cdot111+0.35\cdot2\cdot74.5=68.8\left(g\right)\)
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, Ta có: \(n_{CO}=\dfrac{6,72}{22,4}=0,3\left(mol\right)=n_{CO_2}\)
Theo ĐLBT KL, có: mhh + mCO = mFe + mCO2
⇒ mFe = 18,2 + 0,3.28 - 0,3.44 = 13,4 (g)
b, Giả sử: \(\left\{{}\begin{matrix}n_{Ca}=x\left(mol\right)\\n_{Mg}=y\left(mol\right)\end{matrix}\right.\)
⇒ x + y = 0,2 (1)
PT: \(Ca+2HCl\rightarrow CaCl_2+H_2\)
\(Mg+2HCl\rightarrow MgCl_2+H_2\)
\(CaCl_2+Na_2CO_3\rightarrow CaCO_{3\downarrow}+2NaCl\)
\(MgCl_2+Na_2CO_3\rightarrow MgCO_{3\downarrow}+2NaCl\)
Theo PT: \(\left\{{}\begin{matrix}n_{CaCO_3}=n_{Ca}=x\left(mol\right)\\n_{MgCO_3}=n_{Mg}=y\left(mol\right)\end{matrix}\right.\)
⇒ 100x + 84y = 18,4 (2)
Từ (1) và (2) ⇒ x = y = 0,1 (mol)
Theo PT: \(\left\{{}\begin{matrix}n_{CaCl_2}=n_{Ca}=0,1\left(mol\right)\\n_{MgCl_2}=n_{Mg}=0,1\left(mol\right)\end{matrix}\right.\)
⇒ a = mCaCl2 + mMgCl2 = 0,1.111 + 0,1.95 = 20,6 (g)
Bạn tham khảo nhé!
\(n_{HCl}=0,1.3=0,3\left(mol\right)\\ CaO+2HCl\xrightarrow[]{}CaCl_2+H_2O\\ CaCO_3+2HCl\xrightarrow[]{}CaCl_2+H_2O+CO_2\\ n_{CaO}=a;n_{CaCO_3}=b\\ \Rightarrow\left\{{}\begin{matrix}2a+2b=0,3\\56a+100b=11,7\end{matrix}\right.\\ \Rightarrow a=b=0,075\left(mol\right)\\ n_{CaCl_2}=n_{CaO}=n_{CaCO_3}=0,075mol\\ m_{CaCl_2}=\left(0,075+0,075\right).111=16,65\left(g\right)\)