Hoa tan 200g so3 vao 1lit dd h2so4 17% co d=1.12g/ml.tim C% cua đ thu duoc?
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mdd H2SO4 = 1,12 . 500 = 560 (g)
mH2SO4 = \(\dfrac{17\times560}{100}=95,2\left(g\right)\)
=> mH2O = 560 - 95,2 = 464,8 (g)
=> nH2O = \(\dfrac{464,8}{18}=25,82\left(mol\right)\)
nSO3 = \(\dfrac{100}{80}=1,25\left(mol\right)\)
=> H2O dư
Pt: SO3 + H2O --> H2SO4
1,25 mol----------> 1,25 mol
mH2SO4 = 1,25 . 98 = 122,5 (g)
mH2SO4 sau khi trộn = 122,5 + 95,2 = 217,7 (g)
mdd = 560 + 100 = 660 (g)
C% = \(\dfrac{217,7}{660}.100\%=33\%\)
SO3 + H2O = H2SO4
(32+3*16)= 80........(2+32+4*16)=98
200g.......................x(g)
x= (200 * 98) / 80 = 245g
khoi luong dd H2SO4 truoc phan ung la: m = d * v = 1.12 * 1000 = 1120g
khoi luong H2SO4 truoc pu la: m = (1120 * 17) / 100 = 190.4g
khoi luong H2SO4 sau pu la: m = 190.4 + 245 = 435.4g
khoi luong dd H2SO4 sau pu la: m = 1120 + 200 = 1320g
C% cua dd thu duoc la: C%= ( 435.4 / 1320) *100 = 32.985%
.......SO3 + H2O = H2SO4
(32+3*16)= 80........(2+32+4*16)=98
200g.......................x(g)
x= (200 * 98) / 80 = 245g
khoi luong dd H2SO4 truoc phan ung la: m = d * v = 1.12 * 1000 = 1120g
khoi luong H2SO4 truoc pu la: m = (1120 * 17) / 100 = 190.4g
khoi luong H2SO4 sau pu la: m = 190.4 + 245 = 435.4g
khoi luong dd H2SO4 sau pu la: m = 1120 + 200 = 1320g
C% cua dd thu duoc la: C%= ( 435.4 / 1320) *100 = 32.985%
\(n_{SO_3}=\dfrac{200}{80}=2,5\left(mol\right)\)
mdd H2SO4 17% = 1000.1,12 = 1120 (g)
=> \(m_{H_2SO_4}=\dfrac{1120.17}{100}=190,4\left(g\right)\)
PTHH: SO3 + H2O --> H2SO4
2,5------------>2,5
=> mH2SO4(sau pư) = 2,5.98 + 190,4 = 435,4 (g)
mdd sau pư = 200 + 1120 = 1320 (g)
\(C\%_{dd.H_2SO_4.sau.pư}=\dfrac{435,4}{1320}.100\%=32,985\%\)
nHCl=0,05*2=0,1 mol=nCl
m muối =mKL + mCl =3,1+ 0,1*35,5=6,65g
b. nHCl=n muối= 0,1 mol (Bảo toàn nguyên tố, muối mà MCl)
=> \(\overline{M}_{KL}=\frac{3,1}{0,1}=31\)
=> Kim loại là Na và K
SO3 + H2O → H2SO4
\(m_{ddH_2SO_4.17\%}=1000\times1,12=1120\left(g\right)\)
\(\Rightarrow m_{H_2SO_4.17\%}=1120\times17\%=190,4\left(g\right)\)
\(n_{SO_3}=\dfrac{200}{80}=2,5\left(mol\right)\)
Theo PT: \(n_{H_2SO_4}tt=n_{SO_3}=2,5\left(mol\right)\)
\(\Rightarrow m_{H_2SO_4}tt=2,5\times98=245\left(g\right)\)
\(\Rightarrow m_{H_2SO_4}mới=m_{H_2SO_4}tt+m_{H_2SO_4.17\%}=245+190,4=435,4\left(g\right)\)
\(m_{dd}mới=m_{SO_3}+m_{ddH_2SO_4.17\%}=200+1120=1320\left(g\right)\)
\(\Rightarrow C\%_{dd}mới=\dfrac{m_{H_2SO_4}mới}{m_{dd}mới}=\dfrac{435,4}{1320}\times100\%=32,98\%\)
PTHH: \(SO_3+H_2O\rightarrow H_2SO_4\\ 2,5mol:2,5mol\rightarrow2,5mol\)
\(n_{SO_3}=\dfrac{200}{80}=2,5\left(mol\right)\)
\(m_{H_2SO_4}=2,5.98=245\left(g\right)\)
\(m_{ddH_2SO_417\%}=1000.1,12=1120\left(g\right)\)
\(m_{H_2SO_4trongdd}=17\%.1120=190,4\left(g\right)\)
\(C\%dd=\dfrac{245+190,4}{1120+200}.100\%=32,98\%\)
SO3 + H2O = H2SO4
(32+3*16)= 80........(2+32+4*16)=98
200g.......................x(g)
x= (200 * 98) / 80 = 245g
khoi luong dd H2SO4 truoc phan ung la: m = d * v = 1.12 * 1000 = 1120g
khoi luong H2SO4 truoc pu la: m = (1120 * 17) / 100 = 190.4g
khoi luong H2SO4 sau pu la: m = 190.4 + 245 = 435.4g
khoi luong dd H2SO4 sau pu la: m = 1120 + 200 = 1320g
C% cua dd thu duoc la: C%= ( 435.4 / 1320) *100 = 32.985%