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\(n_{Al_2O_3}=\dfrac{5.1}{102}=0.05\left(mol\right)\)
\(Al_2O_3+3H_2SO_4\rightarrow Al_2\left(SO_4\right)_3+3H_2\)
\(0.05...........0.15...............0.05\)
\(C_{M_{H_2SO_4}}=\dfrac{0.15}{0.2}=0.75\left(M\right)\)
\(C_{M_{Al_2\left(SO_4\right)_3}}=\dfrac{0.05}{0.2}=0.25\left(M\right)\)
MgCl2+2AgNO3->Mg(NO3)2+2AgCl
0,04-----0,08-----------0,04----------0,08
n MgCl2=0,1 mol
n AgNO3=0,08 mol
=>Mgcl2 dư
=>m AgCl=0,08.143,5=11,48g
=>CMMg(NO)2=\(\dfrac{0,04}{0,2}\)=0,2M
=>CMMgcl2 dư=\(\dfrac{0,06}{0,2}\)=0,3M
\(n_{MgCl_2}=0,1\cdot1=0,1mol\)
\(n_{AgNO_3}=0,1\cdot0,8=0,08mol\)
\(MgCl_2+2AgNO_3\rightarrow2AgCl\downarrow+Mg\left(NO_3\right)_2\)
0,1 0,08 0 0
0,04 0,08 0,08 0,04
0,06 0 0,08 0,04
\(m_{\downarrow}=0,08\cdot143,5=11,48g\)
\(C_{M_{Mg\left(NO_3\right)_2}}=\dfrac{n_{Mg\left(NO_3\right)_2}}{V_X}=\dfrac{0,04}{0,2}=0,2M\)
Bài 1:
\(a.n_{NaOH\left(tổng\right)}=0,05.1+0,2.0,2=0,09\left(mol\right)\\ V_{ddNaOH\left(tổng\right)}=50+200=250\left(ml\right)=0,25\left(l\right)\\ C_{MddNaOH\left(cuối\right)}=\dfrac{0,09}{0,25}=0,36\left(M\right)\\ b.n_{HCl}=0,5.0,02=0,01\left(mol\right)\\ n_{H_2SO_4}=0,08.0,2=0,016\left(mol\right)\\ V_{ddsau}=20+80=100\left(ml\right)=0,1\left(l\right)\\ C_{MddH_2SO_4}=\dfrac{0,016}{0,1}=0,16\left(M\right)\\ C_{MddHCl}=\dfrac{0,01}{0,1}=0,1\left(M\right)\)
Bài 2:
\(a.m_{H_2SO_4}=29,4.10\%=2,94\left(g\right)\\ b.n_{H_2SO_4}=\dfrac{2,94}{98}=0,03\left(mol\right)\\ n_{Fe}=\dfrac{0,56}{56}=0,01\left(mol\right)\\ Fe+H_2SO_4\rightarrow FeSO_4+H_2\\ Vì:\dfrac{0,01}{1}< \dfrac{0,03}{1}\Rightarrow H_2SO_4dư\\ n_{H_2SO_4\left(dư\right)}=0,03-0,01=0,02\left(mol\right)\\ m_{H_2SO_4\left(dư\right)}=0,02.98=1,96\left(g\right)\\ n_{H_2}=n_{Fe}=0,01\left(mol\right)\\ \Rightarrow V_{H_2\left(đktc\right)}=0,01.22,4=0,224\left(l\right)\)
Bài 1:
\(n_{KNO_3}=\dfrac{20}{101}=0,198\left(mol\right)\)
\(C_M=\dfrac{n}{V}=\dfrac{0,198}{0,85}=0,233M\)
Bài 2:
\(C_M=\dfrac{n}{V}=\dfrac{0,5}{0,75}=0,66M\)
Bài 3:
\(n_{KNO_3}=2.0,5=1\left(mol\right)\)
\(m_{KNO_3}=1.101=101\left(g\right)\)
Bài 4:
\(C\%=\dfrac{20}{600}.100=3,33\%\)
Bài 1:
\(n_{KNO_3}=\dfrac{20}{101}=0,198\left(mol\right)\)
\(C_{M_{ddKNO_3}}=\dfrac{0,198}{0,85}\approx0,23M\)
Bài 2:
\(C_{M_{ddKCl}}=\dfrac{0,5}{0,75}\approx0,667M\)
Bài 3:
\(n_{KNO_3}=0,5.2=1\left(mol\right)\Rightarrow m_{KNO_3}=1.101=101\left(g\right)\)
Bài 4:
\(C\%_{ddKCl}=\dfrac{20.100\%}{600}=3,333\%\)
\(n_{CaCO_3}=\dfrac{10}{100}=0,1\left(mol\right)\)
a.
\(CaCO_3+2HNO_3\rightarrow Ca\left(NO_3\right)_2+H_2O+CO_2\)
0,1 0,2 0,1 0,1
\(C\%_{dd.HNO_3}=\dfrac{0,2.63.100}{200}=6,3\%\)
b.
\(m_{dd.Ca\left(NO_3\right)_2}=10+200-0,1.44=205,6\left(g\right)\)
\(C\%_{dd.Ca\left(NO_3\right)_2}=\dfrac{0,1.164.100}{205,6}=7,98\%\)
nFe = 5.6/56 = 0.1 (mol)
nHCl = 0.2*2 = 0.4 (mol)
\(Fe+2HCl\rightarrow FeCl_2+H_2\)
LTL : 0.1/1 < 0.4/2 => HCl dư
mHCl dư = ( 0.4 - 0.2 ) * 36.5 = 7.3 (g)
VH2 = 0.2*22.4 = 4.48 (l)
CM FeCl2 = 0.1/0.2 = 0.5(M)
CM HCl dư = 0.2 / 0.2 = 1(M)
a)m Al2(SO4)3=6,84.\(\dfrac{200}{100}\)=13,68g
=>n Al2(SO4)3=0,04 mol
b)n HCl=3.0,2=0,6 mol
a. \(m_{Al_2\left(SO_4\right)_3}=200.6,84\%=13,68\left(g\right)\)
\(n_{Al_2\left(SO_4\right)_3}=\dfrac{13.68}{342}=0,04\left(mol\right)\)
b. \(n_{HNO_3}=0,2.3=0,6\left(mol\right)\)