Hãy nhập câu hỏi của bạn vào đây, nếu là tài khoản VIP, bạn sẽ được ưu tiên trả lời.
a, \(n_{CO_2}=\dfrac{6,72}{22,4}=0,3\left(mol\right)\)
PTHH: Ba(OH)2 + CO2 → BaCO3 + H2O
Mol: 0,3 0,3 0,3
b, \(C_{M_{ddBa\left(OH\right)_2}}=\dfrac{0,3}{0,2}=1,5M\)
c, \(m_{BaCO_3}=0,3.197=59,1\left(g\right)\)
Ta có: \(n_{HCl}=\dfrac{200}{1000}.2=0,4\left(mol\right)\)
\(PTHH:Mg+2HCl--->MgCl_2+H_2\uparrow\left(1\right)\)
a. Theo PT(1): \(n_{Mg}=n_{H_2}=n_{MgCl_2}=\dfrac{1}{2}.n_{HCl}=\dfrac{1}{2}.0,4=0,2\left(mol\right)\)
\(\Rightarrow\left\{{}\begin{matrix}m_{Mg}=0,2.24=4,8\left(g\right)\\V_{H_2}=0,2.22,4=4,48\left(lít\right)\end{matrix}\right.\)
b. \(PTHH:2NaOH+MgCl_2--->Mg\left(OH\right)_2\downarrow+2NaCl\left(2\right)\)
Ta có: \(n_{NaOH}=\dfrac{\dfrac{20\%.100}{100\%}}{40}=0,5\left(mol\right)\)
Ta thấy: \(\dfrac{0,5}{2}>\dfrac{0,2}{1}\)
Vậy NaOH dư.
Theo PT(2): \(n_{Mg\left(OH\right)_2}=n_{MgCl_2}=0,2\left(mol\right)\)
\(\Rightarrow m_{Mg\left(OH\right)_2}=0,2.58=11,6\left(g\right)\)
a: \(Mg+2HCl\rightarrow MgCl_2+H_2\)
200ml=0,2 lít
\(n_{HCl}=0.2\cdot22.4=4.48\left(mol\right)\)
\(\Leftrightarrow n_{H_2}=2.24\left(mol\right)\)
\(\Leftrightarrow m_{H_2}=n_{H_2}\cdot M=2.24\cdot1=2.24\left(g\right)\)
\(n_{MgCl_2}=2.24\left(mol\right)\)
\(\Leftrightarrow n_{Mg}=2.24\left(mol\right)\)
\(\Leftrightarrow m_{Mg}=2.24\cdot24=53.76\left(g\right)\)
a.
\(Na_2CO_3+Ba\left(OH\right)_2\rightarrow BaCO_3+2NaOH\)
b.
\(n_{BaCO_3}=n_{Na_2CO_3}=0,2.1=0,2\left(mol\right)\\ m_{kt}=197.0,2=39,4\left(g\right)\)
c.
\(n_{Ba\left(OH\right)_2}=n_{Na_2CO_3}=0,2\left(mol\right)\\ C\%_{Ba\left(OH\right)_2}=\dfrac{0,2.171.100\%}{200}=17,1\%\)
\(a,PTHH:3NaOH+FeCl_3\rightarrow3NaCl+Fe\left(OH\right)_3\downarrow\\ 2Fe\left(OH\right)_3\rightarrow^{t^o}Fe_2O_3+3H_2O\uparrow\\ b,n_{FeCl_3}=1,5\cdot0,2=0,3\left(mol\right)\\ \Rightarrow n_{NaOH}=3n_{FeCl_3}=0,9\left(mol\right)\\ \Rightarrow V_{dd_{NaOH}}=\dfrac{0,9}{2}=0,45\left(l\right)\)
Theo đề: \(\left\{{}\begin{matrix}X:Fe\left(OH\right)_3\\A:NaCl\\Y:Fe_2O_3\end{matrix}\right.\)
Theo PT: \(n_{NaCl}=3n_{FeCl_3}=0,9\left(mol\right)\)
\(\Rightarrow C_{M_{NaCl}}=\dfrac{0,9}{0,45+0,2}\approx1,4M\)
\(c,\) Theo PT: \(n_{Fe\left(OH\right)_3}=n_{FeCl_3}=0,3\left(mol\right);n_{Fe_2O_3}=\dfrac{1}{2}n_{Fe\left(OH\right)_3}=0,15\left(mol\right)\)
\(\Rightarrow\left\{{}\begin{matrix}m_X=m_{Fe\left(OH\right)_3}=0,3\cdot107=32,1\left(g\right)\\m_Y=m_{Fe_2O_3}=0,15\cdot160=24\left(g\right)\end{matrix}\right.\)
Câu 4 :
\(n_{SO2}=\dfrac{3,36}{22,4}=0,15\left(mol\right)\)
Pt : \(SO_2+Ba\left(OH\right)_2\rightarrow BaSO_3+H_2O|\)
1 1 1 1
0,15 0,15 0,15
a) \(n_{Ba\left(OH\right)2}=\dfrac{0,15.1}{1}=0,15\left(mol\right)\)
⇒ \(m_{Ba\left(OH\right)2}=0,15.171=25,65\left(g\right)\)
\(C_{ddBa\left(OH\right)2}=\dfrac{25,65.100}{150}=17,1\)0/0
b) \(n_{BaSO3}=\dfrac{0,15.1}{1}=0,15\left(mol\right)\)
⇒ \(m_{BaSO3}=0,15.217=32,55\left(g\right)\)
c) Pt : \(Ba\left(OH\right)_2+2HCl\rightarrow BaCl_2+2H_2O|\)
1 2 1 2
0,15 0,3
\(n_{HCl}=\dfrac{0,15.2}{1}=0,3\left(mol\right)\)
\(m_{HCl}=0,3.36,5=10,95\left(g\right)\)
\(m_{ddHCl}=\dfrac{10,95.100}{20}=54,75\left(g\right)\)
\(V_{ddHCl}=\dfrac{54,75}{1,2}=45,625\left(ml\right)\)
Chúc bạn học tốt
\(a)Ba\left(OH\right)_2+Na_2CO_3\rightarrow2NaOH+BaCO_3\\ n_{Ba\left(OH\right)_2}=0,2.2=0,4mol\\ n_{BaCO_3}=n_{Na_2CO_3}=n_{Ba\left(OH\right)_2}=0,4mol\\ m_{BaCO_3}=0,4.171=68,4g\\ b)V_{Na_2CO_3}=\dfrac{0,4}{1}=0,4l\\ c)n_{NaOH}=2n_{Ba\left(OH\right)_2}=0,8mol\\ C_{M\left(NaOH\right)}=\dfrac{0,8}{0,2+0,4}=\dfrac{4}{3}M\)
\(n_{BaCl_2}=0.2\cdot0.5=0.1\left(mol\right)\)
\(BaCl_2+K_2SO_4\rightarrow BaSO_4+2KCl\)
\(0.1.............0.1.........................0.2\)
\(V_{dd_{K_2SO_4}}=\dfrac{0.1}{1}=0.1\left(l\right)\)
\(V_{dd}=0.2+0.1=0.3\left(l\right)\)
\(C_{M_{KCl}}=\dfrac{0.2}{0.3}=0.67\left(M\right)\)
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: \(V_{dd_{KCl}}=V_{dd_{BaCl_2}}=0,1\left(lít\right)\)
\(\Rightarrow C_{M_{KCl}}=\dfrac{0,2}{0,1}=2M\)
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