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a) 200ml = 0,2 lít ; n\(H_2SO_4\) = \(\dfrac{29,4}{98}\) = 0,3(mol)
=> CM = \(\dfrac{0,3}{0,2}\) = 1,5(M)
b) C% = \(\dfrac{C_M.M_{H_2SO_4}}{10D}\) = \(\dfrac{1,5.98}{10.1,2}\) = 12,25%
a, PT: \(Fe+H_2SO_4\rightarrow FeSO_4+H_2\)
b, \(n_{Fe}=\dfrac{5,6}{56}=0,1\left(mol\right)\)
Theo PT: \(n_{H_2}=n_{Fe}=0,1\left(mol\right)\Rightarrow V_{H_2}=0,1.22,4=2,24\left(l\right)\)
c, \(n_{H_2SO_4}=n_{Fe}=0,1\left(mol\right)\Rightarrow C_{M_{H_2SO_4}}=\dfrac{0,1}{0,2}=0,5\left(M\right)\)
SO3 + H2O \(\rightarrow\) H2SO4
nSO3=\(\dfrac{200}{80}=2,5\left(mol\right)\)
Theo PTHH ta có:
nSO3=nH2SO4=2,5(mol)
mH2SO4=98.2,5=245(g)
mdd H2SO4 17 % =1000.1,12=1120(g)
mH2SO4trong dd=1120.\(\dfrac{17}{100}=190,4\left(g\right)\)
C% dd H2SO4 =\(\dfrac{245+190,4}{1120+200}.100\%=33\%\)
`Fe_2O_3+3H_2SO_4->Fe_2(SO_4)_3+3H_2O`
0,0625----------0,1875---------0,0625 mol
`->n_(Fe_2O_3)=10/160=0,0625mol`
`->m_(Fe_2(SO_4)_3)=0,0625.400=25g`
`->C%(H_2SO_4)=((0,1875.98)/(450)).100%=4,083%`
`#YBtran<3`
\(n_{Fe_2O_3}=\dfrac{10}{160}=0,0625\left(mol\right)\\ Fe_2O_3+3H_2SO_4\rightarrow Fe_2\left(SO_4\right)_3+3H_2O\\ n_{Fe_2\left(SO_4\right)_3}=n_{Fe_2O_3}=0,0625\left(mol\right)\\ a,m=m_{Fe_2\left(SO_4\right)_3}=400.0,0625=25\left(g\right)\\ b,n_{H_2SO_4}=3.0,0625=0,1875\left(mol\right)\\ C\%_{ddH_2SO_4}=\dfrac{0,1875.98}{450}.100\%\approx4,083\%\)
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:
\(a.m_{H_2SO_4}=29,4.10\%=2,94\left(g\right)\\ b.n_{H_2SO_4}=\dfrac{2,94}{98}=0,03\left(mol\right)\\ n_{Fe}=\dfrac{0,56}{56}=0,01\left(mol\right)\\ Fe+H_2SO_4\rightarrow FeSO_4+H_2\\ Vì:\dfrac{0,01}{1}< \dfrac{0,03}{1}\Rightarrow H_2SO_4dư\\ n_{H_2SO_4\left(dư\right)}=0,03-0,01=0,02\left(mol\right)\\ m_{H_2SO_4\left(dư\right)}=0,02.98=1,96\left(g\right)\\ n_{H_2}=n_{Fe}=0,01\left(mol\right)\\ \Rightarrow V_{H_2\left(đktc\right)}=0,01.22,4=0,224\left(l\right)\)
a, PTPƯ: SO3 + H2O ---> H2SO4
nSO3=\(\dfrac{2,24}{22,4}=0,1mol\)
1 mol SO3 ---> 0,1 mol H2SO4
nên 0,1 mol SO3 ---> 0,1 mol H2SO4
CM H2SO4=\(\dfrac{0,1}{0,5}\)=0,2 M
b, PTPƯ: Zn + H2SO4 ---> ZnSO4 + H2
1 mol H2SO4 ---> 1 mol Zn
nên 0,1 mol H2SO4 ---> 0,1 mol Zn
mZn=0,1.65=6,5 g
\(n_{SO_2}=\dfrac{7.84}{22.4}=0.07\left(mol\right)\)
\(2SO_2+O_2\underrightarrow{^{t^0}}2SO_3\)
\(0.07.............0.07\)
\(m_{dd_{H_2SO_4}}=57.2\cdot1.5=85.8\left(g\right)\)
\(m_{H_2SO_4}=85.8\cdot60\%=51.48\left(g\right)\)
\(SO_3+H_2O\rightarrow H_2SO_4\)
\(0.07..................0.07\)
\(m_{dd}=0.07\cdot80+85.8=91.4\left(g\right)\)
\(\sum n_{H_2SO_4}=0.07\cdot98+51.48=58.34\left(g\right)\)
\(C\%_{H_2SO_4}=\dfrac{58.34}{91.4}\cdot100\%=63.8\%\)
a) Al2O3 + 3H2SO4 --> Al2(SO4)3 + 3H2O
b) \(n_{Al_2O_3}=\dfrac{10,2}{102}=0,1\left(mol\right)\)
PTHH: Al2O3 + 3H2SO4 --> Al2(SO4)3 + 3H2O
0,1---->0,3------->0,1
=> m = 0,1.342 = 34,2 (g)
c) \(C\%_{dd.H_2SO_4}=\dfrac{0,3.98}{120}.100\%=24,5\%\)
\(n_{SO_3}=\dfrac{200}{80}=2.5\left(mol\right)\)
\(m_{dd_{H_2SO_4}}=1000\cdot1.12=1120\left(g\right)\)
\(m_{H_2SO_4}=1120\cdot17\%=190.4\left(g\right)\)
\(SO_3+H_2O\rightarrow H_2SO_4\)
\(2.5.....................2.5\)
\(m_{H_2SO_4}=2.5\cdot98+190.4=435.4\left(g\right)\)
\(m_{dd_{H_2SO_4}}=200+1120=1320\left(g\right)\)
\(C\%_{H_2SO_4}=\dfrac{435.4}{1320}\cdot100\%=33\%\)
$SO_3 + H_2O \to H_2SO_4$
$n_{H_2SO_4} = n_{SO_3} = \dfrac{200}{80} = 2,5(mol)$
$m_{dd\ H_2SO_4\ 17\%} =1000.1,12 = 1120(gam)$
Sau khi pha :
$m_{dd} = 200 + 1120 = 1320(gam)$
$m_{H_2SO_4} = 1120.17\% + 2,5.98 = 435,4(gam)$
$C\%_{H_2SO_4} = \dfrac{435,4}{1320}.100\% = 33\%$