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Ta có: \(n_{ZnO}=\dfrac{16,2}{81}=0,2\left(mol\right)\)
a, PT: \(ZnO+2HCl\rightarrow ZnCl_2+H_2O\)
______0,2_____0,4____0,2 (mol)
b, \(m_{HCl}=0,4.36,5=14,6\left(g\right)\Rightarrow m_{ddHCl}=\dfrac{14,6}{10\%}=146\left(g\right)\)
c, \(C\%_{ZnCl_2}=\dfrac{0,2.136}{16,2+146}.100\%\approx16,77\%\)
Bạn tham khảo nhé!
\(n_{BaCl_2}=0.2\cdot0.5=0.1\left(mol\right)\)
\(BaCl_2+K_2SO_4\rightarrow BaSO_4+2KCl\)
\(0.1.............0.1.........................0.2\)
\(V_{dd_{K_2SO_4}}=\dfrac{0.1}{1}=0.1\left(l\right)\)
\(V_{dd}=0.2+0.1=0.3\left(l\right)\)
\(C_{M_{KCl}}=\dfrac{0.2}{0.3}=0.67\left(M\right)\)
Đổi 200ml = 0,2 lít
Ta có: \(n_{BaCl_2}=0,5.0,2=0,1\left(mol\right)\)
a. PTHH: \(BaCl_2+K_2SO_4--->BaSO_4\downarrow+2KCl\)
Theo PT: \(n_{K_2SO_4}=n_{BaCl_2}=0,1\left(mol\right)\)
\(\Rightarrow V_{dd_{K_2SO_4}}=\dfrac{0,1}{1}=0,1\left(lít\right)\)
b. Theo PT: \(n_{KCl}=2.n_{BaCl_2}=2.0,1=0,2\left(mol\right)\)
Ta có: \(V_{dd_{KCl}}=V_{dd_{BaCl_2}}=0,1\left(lít\right)\)
\(\Rightarrow C_{M_{KCl}}=\dfrac{0,2}{0,1}=2M\)
PTHH: \(CH_3COOH+KHCO_3\rightarrow CH_3COOK+H_2O+CO_2\uparrow\)
a) Ta có: \(n_{CH_3COOH}=\dfrac{200\cdot24\%}{60}=0,8\left(mol\right)=n_{KHCO_3}\)
\(\Rightarrow m_{ddKHCO_3}=\dfrac{0,8\cdot100}{16,8\%}\approx476.2\left(g\right)\)
b) Theo PTHH: \(n_{CH_3COOK}=0,8\left(mol\right)=n_{CO_2}\)
\(\Rightarrow\left\{{}\begin{matrix}m_{CH_3COOK}=0,8\cdot98=78,4\left(g\right)\\m_{CO_2}=0,8\cdot44=35,2\left(g\right)\end{matrix}\right.\)
Mặt khác: \(m_{dd}=m_{ddCH_3COOH}+m_{ddKHCO_3}-m_{CO_2}=641\left(g\right)\)
\(\Rightarrow C\%_{CH_3COOK}=\dfrac{78,4}{641}\cdot100\%\approx12,23\%\)
PTHH: \(2NaOH+H_2SO_4\rightarrow Na_2SO_4+2H_2O\)
Ta có: \(\left\{{}\begin{matrix}n_{NaOH}=\dfrac{200\cdot4\%}{40}=0,2\left(mol\right)\\n_{H_2SO_4}=\dfrac{150\cdot9,8\%}{98}=0,15\left(mol\right)\end{matrix}\right.\)
Xét tỉ lệ: \(\dfrac{0,2}{2}< \dfrac{0,15}{1}\) \(\Rightarrow\) Axit còn dư, tính theo Bazơ
\(\Rightarrow\left\{{}\begin{matrix}n_{Na_2SO_4}=0,1\left(mol\right)\\n_{H_2SO_4\left(dư\right)}=0,05\left(mol\right)\Rightarrow m_{H_2SO_4\left(dư\right)}=0,05\cdot98=4,9\left(g\right)\end{matrix}\right.\) \(\Rightarrow\left\{{}\begin{matrix}C\%_{Na_2SO_4}=\dfrac{0,1\cdot142}{200+150}\cdot100\%\approx4,06\%\\C\%_{H_2SO_4\left(dư\right)}=\dfrac{4,9}{200+150}\cdot100\%=1,4\%\end{matrix}\right.\)
500ml=0.5l
nBaOH2 =0.5 x1=0.5 mol
MH2SO4=500.15%=75g
nH2SO4= xấp xỉ 0.8mol
H2SO4 dư tính theo BaOH2
pthh: Ba(OH)2 + H2SO4 => BaSO4+H2O
Theo pthh nBaSO4= nBa(OH)2=0.5mol
=>m kết tủa= 0.5x233=116.5g
theo pthh nH2SO4 phản ứng=nBaOH2= 0.5 mol
=> nH2SO4 Dư=0.8-0.5=0.3 mol
=>
m dư=0.3x98=29.4g
mH2SO4 đã dùng là m phản ứng? nếu thế thì m đã dung là 75-29.4=45.6
còn nếu m đã dùng là m chất tan thi là 75g như trên =))
\(2Al+3H_2SO_4 \to Al_2(SO_4)_3+3H_2\\ n_{Al}=0,4(mol)\\ a/\\ n_{H_2}=\frac{3}{2}.0,4=0,6(mol)\\ V_{H_2}=0,6.22,4=13,44(l)\\ b/\\ n_{H_2SO_4}=n_{H_2}=0,6(mol)\\ n_{ddH_2SO_4}=\frac{0,6.98.100}{20}=294(g)\\ c/\\ n_{Al_2(SO_4)_3}=0,2(mol)\\ C\%_{Al_2(SO_4)_3}=\frac{0,2.342}{10,8+294-0,6.2}.100\%=22,52\%\)
n Ba(OH)2 = 2.0,2=0,4 mol
\(Ba\left(OH\right)_2+SO_2->BaSO_3+H_2O\)
0,4 ................0,4...........0,4
m BaSO3 = 0,4. ( 138+32+16.3)=87,2 g
v SO2 = 0,4.22,4=8,96 lít
m BaSO3 = 0,4. ( 137+32+16.3)=86,8 g
xin lũi nha mình nhìn nhầm bạn thông cảm
\(n_{BaCl_2}=\dfrac{208.15\%}{208}=0,15\left(mol\right)\\ n_{H_2SO_4}=\dfrac{150.19,6\%}{98}=0,3\left(mol\right)\\ BaCl_2+H_2SO_4\rightarrow BaSO_4\downarrow+2HCl\\ Vì:\dfrac{0,15}{1}< \dfrac{0,3}{1}\Rightarrow H_2SO_4dư\\ n_{H_2SO_4\left(p.ứ\right)}=n_{BaSO_4}=n_{BaCl_2}=0,15\left(mol\right)\\ n_{HCl}=2.0,15=0,3\left(mol\right)\\ n_{H_2SO_4\left(dư\right)}=0,13-0,15=0,15\left(mol\right)\\ m_{HCl}=0,3.36,5=10,95\left(g\right)\\ m_{BaSO_4}=233.0,15=34,95\left(g\right)\\ m_{H_2SO_4\left(dư\right)}=0,15.98=14,7\left(g\right)\\ m_{ddsau}=208+150-34,95=323,05\left(g\right)\\ C\%_{ddHCl}=\dfrac{10,95}{323,05}.100\approx3,39\%\)
\(C\%_{ddH_2SO_4\left(dư\right)}=\dfrac{14,7}{323,05}.100\approx4,55\%\)
\(n_{BaCl_2}=\dfrac{31,2}{208}=0,15mol\)
\(BaCl_2+H_2SO_4\rightarrow BaSO_4\downarrow+2HCl\)
0,15 0,15 0,15 0,3
a)\(m_{BaSO_4}=0,15\cdot233=34,95\left(g\right)\)
b)\(m_{H_2SO_4}=0,15\cdot98=14,7\left(g\right)\)
\(\Rightarrow m_{ddH_2SO_4}=\dfrac{14,7}{19,6}\cdot100=75\left(g\right)\)
c)\(m_{HCl}=0,3\cdot36,5=10,95\left(g\right)\)
\(m_{ddsau}=31,2+75-34,95=71,25\left(g\right)\)
\(\Rightarrow C\%_{HCl}=\dfrac{10,95}{71,25}\cdot100\%=15,37\%\)