hòa tan 12g hỗn hợp 2 muối MgCO3 và MgSO4 cần vừa đủ 200 ml đ HCl thấy thoát ra 896 ml khí ở điều kiện tiêu chuẩn
a) viết phương trình phản ứng
b) tính khối lượng của mỗi chất trong hộn hợp ban đầu
c) tính CM của dd HCl đã dùng
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a) Pt : \(Mg+2HCl\rightarrow MgCl_2+H_2|\)
1 2 1 1
0,3 0,6 0,3
\(MgO+2HCl\rightarrow MgCl_2+H_2O|\)
1 2 1 1
0,1 0,2
b) \(n_{Mg}=\dfrac{0,3.1}{1}=0,3\left(mol\right)\)
\(m_{Mg}=0,3.24=7,2\left(g\right)\)
\(m_{MgO}=11,2-7,2=4\left(g\right)\)
c) 0/0Mg = \(\dfrac{7,2.100}{11,2}=64,29\)0/0
0/0MgO = \(\dfrac{4.100}{11,2}=35,71\)0/0
d) Có : \(m_{MgO}=4\left(g\right)\)
\(n_{MgO}=\dfrac{4}{40}=0,1\left(mol\right)\)
\(n_{HCl\left(tổng\right)}=0,6+0,2=0,8\left(mol\right)\)
\(m_{HCl}=0,8.36,5=29,2\left(g\right)\)
\(C_{ddHCl}=\dfrac{29,2.100}{200}=14,6\)0/0
Chúc bạn học tốt
a, PT: \(2Al+6HCl\rightarrow2AlCl_3+3H_2\)
\(Al_2O_3+6HCl\rightarrow2AlCl_3+3H_2O\)
b, Ta có: \(n_{H_2}=0,15\left(mol\right)\)
Theo PT: \(n_{Al}=\dfrac{2}{3}n_{H_2}=0,1\left(mol\right)\)
\(\Rightarrow m_{Al}=0,1.27=2,7\left(g\right)\)
\(\Rightarrow m_{Al_2O_3}=7,8-2,7=5,1\left(g\right)\)
c, Có: \(n_{Al_2O_3}=\dfrac{5,1}{102}=0,05\left(mol\right)\)
Theo PT: \(n_{HCl}=3n_{Al}+6n_{Al_2O_3}=0,6\left(mol\right)\)
\(n_{AlCl_3}=n_{Al}+2n_{Al_2O_3}=0,2\left(mol\right)\)
\(\Rightarrow m_{HCl}=0,6.36,5=21,9\left(g\right)\Rightarrow m_{ddHCl}=\dfrac{21,9}{10\%}=219\left(g\right)\)
⇒ m dd sau pư = 7,8 + 219 - 0,15.2 = 226,5 (g)
\(\Rightarrow C\%_{AlCl_3}=\dfrac{0,2.133,5}{226,5}.100\%\approx11,79\%\)
Bạn tham khảo nhé!
\(n_{H_2}=\dfrac{2.24}{22.4}=0.1\left(mol\right)\)
\(Zn+2HCl\rightarrow ZnCl_2+H_2\)
\(0.1.......0.2......................0.1\)
Chất rắn X : Cu
\(m_{Zn}=0.1\cdot65=6.5\left(g\right)\Rightarrow m_{Cu}=19.3-6.5=12.8\left(g\right)\)
\(n_{Cu}=\dfrac{12.8}{64}=0.2\left(mol\right)\)
\(C_{M_{HCl}}=\dfrac{0.2}{0.2}=1\left(M\right)\)
\(2Cu+O_2\underrightarrow{^{^{t^o}}}2CuO\)
\(0.2........0.1\)
\(m_{tăng}=m_{O_2}=0.1\cdot32=3.2\left(g\right)\)
\(n_{CO_2}=\dfrac{5,6}{22,4}=0,25mol\)
\(\left\{{}\begin{matrix}CH_4:x\left(mol\right)\\C_2H_4:y\left(mol\right)\end{matrix}\right.\Rightarrow\left\{{}\begin{matrix}16x+28y=3,6\\BTC:x+2y=n_{CO_2}=0,25\end{matrix}\right.\)
\(\Rightarrow\left\{{}\begin{matrix}x=0,05mol\\y=0,1mol\end{matrix}\right.\)
a)\(CH_4+2O_2\underrightarrow{t^o}CO_2+2H_2O\)
\(C_2H_4+3O_2\underrightarrow{t^o}2CO_2+2H_2O\)
b)\(m_{CH_4}=0,05\cdot16=0,8g\)
\(m_{C_2H_4}=0,1\cdot28=2,8g\)
c)\(\Sigma n_{O_2}=2n_{CH_4}+3n_{C_2H_4}=2\cdot0,05+3\cdot0,1=0,4mol\)
\(\Rightarrow V_{O_2}=0,4\cdot22,4=8,96l\)
\(\Rightarrow V_{kk}=5V_{O_2}=5\cdot8,96=44,8l\)
\(n_{H2}=\dfrac{2,24}{22,4}=0,1\left(mol\right)\)
a) \(Fe+H_2SO_4\rightarrow FeSO_4+H_2\)
\(Al_2O_3+3H_2SO_4\rightarrow Al_2\left(SO_4\right)_3+3H_2O\)
b) \(n_{Fe}=n_{H2}=n_{H2SO4}=0,1\left(mol\right)\Rightarrow m_{Fe}=0,1.56=5,6\left(g\right)\)
\(\Rightarrow m_{Al2O3}=15,8-5,6=10,2\left(g\right)\)
c) Ta có : \(n_{Al2O3}=\dfrac{10,2}{102}=0,1\left(mol\right)\Rightarrow n_{H2SO4}=3n_{Al2O3}=0,3\left(mol\right)\)
\(C_{MddH2SO4}=\dfrac{0,1+0,3}{0,2}=2M\)
a. PTHH:
\(Ca+2H_2O--->Ca\left(OH\right)_2+H_2\left(1\right)\)
\(CaO+H_2O--->Ca\left(OH\right)_2\left(2\right)\)
b. Ta có: \(n_{H_2}=\dfrac{2,24}{22,4}=0,1\left(mol\right)\)
Theo PT(1): \(n_{Ca}=n_{H_2}=0,1\left(mol\right)\)
\(\Rightarrow m_{Ca}=0,1.40=4\left(g\right)\)
\(\Rightarrow\%_{m_{Ca}}=\dfrac{4}{9,6}.100\%=41,7\%\)
\(\%_{m_{CaO}}=100\%-41,7\%=58,3\%\)
c. Ta có: \(n_{CaO}=\dfrac{9,6-4}{56}=0,1\left(mol\right)\)
Ta có: \(n_{hh}=0,1+0,1=0,2\left(mol\right)\)
Theo PT(1,2): \(n_{Ca\left(OH\right)_2}=n_{hh}=0,2\left(mol\right)\)
\(\Rightarrow m_{Ca\left(OH\right)_2}=0,2.74=14,8\left(g\right)\)
\(n_{CO_2}=\dfrac{0,896}{22,4}=0,04(mol)\\ a,MgCO_3+2HCl\to MgCl_2+H_2O+CO_2\uparrow\\ \Rightarrow n_{MgCO_3}=0,04(mol)\\ b,m_{MgCO_3}=0,04.84=3,36(g)\\ m_{MgSO_4}=12-3,36=8,64(g)\\ c,n_{HCl}=0,08(mol)\\ \Rightarrow C_{M_{HCl}}=\dfrac{0,08}{0,2}=0,016M\)
a) MgCO3 + 2HCl --> MgCl2 + CO2 + H2O
b) \(n_{CO_2}=\dfrac{0,896}{22,4}=0,04\left(mol\right)\)
PTHH: MgCO3 + 2HCl --> MgCl2 + CO2 + H2O
______0,04<------0,08<---------------0,04
=> mMgCO3 = 0,04.84 = 3,36(g)
mMgSO4 = 12-3,36 = 8,64(g)
c) \(C_M=\dfrac{0,08}{0,2}=0,4M\)