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Ta có: \(n_{NaOH}=0,1.0,5=0,05\left(mol\right)\)
PT: \(CH_3COOH+NaOH\rightarrow CH_3COONa+H_2O\)
Theo PT: \(n_{CH_3COOH}=n_{CH_3COONa}=n_{NaOH}=0,05\left(mol\right)\)
a, \(C_{M_{CH_3COOH}}=\dfrac{0,05}{0,2}=0,25\left(M\right)\)
b, \(m_{CH_3COONa}=0,05.82=4,1\left(g\right)\)
\(n_{CuO}=\dfrac{8}{80}=0,1\left(mol\right)\)
a) Pt : \(CuO+2HCl\rightarrow CuCl_2+H_2O|\)
1 2 1 1
0,1 0,2 0,1
b) \(n_{HCl}=\dfrac{0,1.2}{1}=0,2\left(mol\right)\)
⇒ \(m_{HCl}=0,2.36,5=7,3\left(g\right)\)
\(C_{ddHCl}=\dfrac{7,3.100}{200}=3,65\)0/0
c) \(n_{CuCl2}=\dfrac{0,2.1}{2}=0,1\left(mol\right)\)
⇒ \(m_{CuCl2}=0,1.135=13,5\left(g\right)\)
Chúc bạn học tốt
\(n_{CuO}=\dfrac{32}{80}=0,4(mol)\\ CuO+2HCl\to CuCl_2+H_2\\ \Rightarrow n_{HCl}=0,8(mol);n_{CuCl_2}=n_{H_2}=0,4(mol)\\ a,m_{dd_{HCl}}=\dfrac{0,8.36,5}{20\%}=146(g)\\ b,m_{CuCl_2}=0,4.135=54(g)\\ c,C\%_{CuCl_2}=\dfrac{54}{32+146-0,4.2}.100\%=30,47\%\)
\(CuO + 2HCl \rightarrow CuCl_2 + H_2O\)
\(n_{CuO}= \dfrac{32}{80}= 0,4 mol\)
Theo PTHH:
\(n_{HCl}= 2n_{CuO}= 0,8 mol\)
\(\Rightarrow m_{HCl}= 0,8 . 36,5=29,2 g\)
\(\rightarrow m_{dd HCl}= \dfrac{29,2 . 100%}{20%}= 146 g\)
b) Muối tạo thành là CuCl2
Theo PTHH:
\(n_{CuCl_2}= n_{CuO}= 0,4 mol\)
\(\Rightarrow m_{CuCl_2}= 0,4 . 135= 54g\)
c)
\(m_{dd sau pư}= m_{CuO} + m_{dd HCl}= 32 + 146=178 g\)
C%= \(\dfrac{54}{178} . 100\)%= 30,337 %
\(m_{CH_3COOH}=24\%.150=36\left(g\right)\\ \rightarrow n_{CH_3COOH}=\dfrac{36}{60}=0,6\left(mol\right)\)
PTHH: 2CH3COOH + Na2CO3 ---> 2CH3COONa + CO2 + H2O
0,6 0,3 0,6 0,3
=> VCO2 = 0,3.22,4 = 6,72 (l)
\(m_{Na_2CO_3}=0,3.31,8\left(g\right)\)
=> \(m_{ddNa_2CO_3}=\dfrac{31,8}{21,2\%}=150\left(g\right)\)
mCO2 = 0,3.44 = 13,2 (g)
\(m_{dd}=150+150-13,2=286,8\left(g\right)\)
\(m_{CH_3COONa}=0,3.82=24,6\left(g\right)\\ \rightarrow C\%_{CH_3COONa}=\dfrac{24,6}{286,8}=8,58\%\)
mH2SO4= 36(g) -> nH2SO4=18/49(mol)
a) PTHH: Fe2O3 + 3 H2SO4 -> Fe2(SO4)3 + 3 H2O
nFe2(SO4)3= nFe2O3= nH2SO4/3= 18/49 : 3=6/49(mol)
=>mFe2O3=6/49 . 160=960/49 (g)
b) mFe2(SO4)3= 400. 6/49=2400/49(g)
mdd(sau)= mFe2O3+ mddH2SO4= 960/49 + 50= 3410/49
=> C%ddFe2(SO4)3= [ (2400/49)/ (3410/49)].100=70,381%
=> C%ddFe2(SO4)3= (48,98/
a)
$CH_3COOH + NaHCO_3 \to CH_3COONa + CO_2 + H_2O$
b)
n NaHCO3 = n CH3COOH = 100.12%/60 = 0,2(mol)
m dd NaHCO3 = 0,2.84/8% = 210(gam)
c)
n CO2 = n CH3COOH = 0,2(mol)
=> V CO2 = 0,2.22,4 = 4,48(lít)
d)
m dd = m dd CH3COOH + m dd NaHCO3 - m CO2 = 100 + 210 - 0,2.44 = 301,2(gam)
C% CH3COONa = 0,2.82/301,2 .100% = 5,44%
\(m_{CH_3COOH}=150.12\%=18g\)
\(n_{CH_3COOH}=\dfrac{18}{60}=0,3mol\)
\(2CH_3COOH+Na_2CO_3\rightarrow2CH_3COONa+CO_2+H_2O\)
0,3 0,15 0,3 0,15 ( mol )
\(m_{ddNa_2CO_3}=\left(0,15.106\right):10,6\%=150g\)
\(V_{CO_2}=0,15.22,4=3,36l\)
\(m_{CH_3COONa}=0,3.82=24,6g\)
\(m_{ddspứ}=150+150-0,15.44=293,4g\)
\(C\%_{CH_3COONa}=\dfrac{24,6}{293,4}.100=8,28\%\)
\(m_{CH_3COOH}=\dfrac{80.9}{100}=7,2\left(g\right)\)
\(n_{CH_3COOH}=\dfrac{7,2}{60}=0,12\left(mol\right)\)
PTHH :
\(15CH_3COOH+10NaHCO_3\rightarrow10CH_3COONa+2H_2O+20CO_2\uparrow\)
0,12 0,08 0,08 0,016 0,16
\(a,m_{NaHCO_3}=84.0,08=6,72\left(g\right)\)
\(m_{ddNaHCO_3}=\dfrac{6,72.100}{4,2}=160\left(g\right)\)
\(b,m_{CH_3COONa}=0,08.82=6,56\left(g\right)\)
\(m_{H_2O}=0,016.18=0,288\left(g\right)\)
\(m_{CO_2}=0,16.44=7,04\left(g\right)\)
\(m_{ddCH_3COONa}=80+160-0,288-7,04=232,672\left(g\right)\)
\(C\%=\dfrac{6,56}{232,672}\approx2,82\%\)
\(Na_2CO_3(0,05)+2CH_3COOH(0,1)--->2CH_3COONa(0,1)+CO_2(0,05)+H_2O\)
\(m_{Na_2CO_3}=\dfrac{10,6.50}{100}=5,3\left(g\right)\)
\(\Rightarrow n_{Na_2CO_3}=0,05\left(mol\right)\)
Phản ứng vừa đủ:
Theo PTHH: \(nCH_3COOH=0,1\left(mol\right)\)
\(\Rightarrow m_{CH_3COOH}=60.0,1=6\left(g\right)\)
\(b)\)
Theo PTHH: \(n_{CO_2}=0,05\left(mol\right)\)
\(\Rightarrow m_{CO_2}=2,2\left(g\right)\)
\(m_{ddsau}=50+50-2,2=97,8\left(g\right)\)
Dung dich muối tạo thành là CH3COONa
Theo PTHH: \(n_{CH_3COONa}=0,1\left(mol\right)\)
\(\Rightarrow m_{CH_3COONa}=82.0,1=8,2\left(g\right)\)
\(\Rightarrow C\%CH_3COONa=\dfrac{8,2}{97,8}.100\%=8,38\%\)