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\(n_{CuSO_4}=\dfrac{200.16\%}{160}=0,2\left(mol\right)\)
PTHH :
\(CuSO_4+2NaOH\rightarrow Cu\left(OH\right)_2\downarrow+Na_2SO_4\)
0,2 0,4 0,2 0,2
\(m_{NaOH}=0,4.40=16\left(g\right)\)
\(m_{ddNaOH}=\dfrac{16.100}{10}=160\left(g\right)\)
\(c,m_{Na_2SO_4}=0,2.142=28,4\left(g\right)\)
\(m_{ddNa_2SO_4}=200+160-\left(0,2.98\right)=340,4\left(g\right)\)
\(C\%_{Na_2SO_4}=\dfrac{28,4}{240,4}.100\%\approx8,34\%\)
\(d,PTHH:\)
\(Cu\left(OH\right)_2\underrightarrow{t^o}CuO+H_2O\)
0,2 0,2
\(m_{CuO}=0,2.80=16\left(g\right)\)
a, \(CuSO_4+2NaOH\rightarrow Cu\left(OH\right)_2+Na_2SO_4\)
b, \(m_{CuSO_4}=200.16\%=32\left(g\right)\Rightarrow n_{CuSO_4}=\dfrac{32}{160}=0,2\left(mol\right)\)
\(n_{NaOH}=2n_{CuSO_4}=0,4\left(mol\right)\Rightarrow m_{ddNaOH}=\dfrac{0,4.40}{10\%}=160\left(g\right)\)
c, \(n_{Cu\left(OH\right)_2}=n_{Na_2SO_4}=n_{CuSO_4}=0,2\left(mol\right)\)
\(\Rightarrow C\%_{Na_2SO_4}=\dfrac{0,2.142}{200+160-0,2.98}.100\%\approx8,34\%\)
d, \(Cu\left(OH\right)_2\underrightarrow{t^o}CuO+H_2O\)
\(n_{CuO}=n_{Cu\left(OH\right)_2}=0,2\left(mol\right)\Rightarrow m_{CuO}=0,2.80=16\left(g\right)\)
Câu 3 :
\(m_{ct}=\dfrac{10.80}{100}=8\left(g\right)\)
\(n_{NaOH}=\dfrac{8}{40}=0,2\left(mol\right)\)
a) Hiện tượng : Xuất hiện kết tủa trắng
Pt : \(2NaOH+MgSO_4\rightarrow Na_2SO_4+Mg\left(OH\right)_2|\)
2 1 1 1
0,2 0,1 0,1 0,1
\(n_{Mg\left(OH\right)2}=\dfrac{0,2.1}{2}=0,1\left(mol\right)\)
⇒ \(m_{Mg\left(OH\right)2}=0,1.58=5,8\left(g\right)\)
b) \(n_{MgSO4}=\dfrac{0,2.1}{2}=0,1\left(mol\right)\)
\(m_{MgSO4}=0,1.120=12\left(g\right)\)
\(m_{ddMgSO}=\dfrac{12.100}{10}=120\left(g\right)\)
c) \(n_{Na2SO4}=\dfrac{0,1.1}{1}=0,1\left(mol\right)\)
⇒ \(m_{Na2SO4}=0,1.142=14,2\left(g\right)\)
\(m_{ddspu}=80+120-5,8=194,2\left(g\right)\)
\(C_{Na2SO4}=\dfrac{14,2.100}{194,2}=7,31\)0/0
Chúc bạn học tốt
Câu 4 :
\(n_{Fe}=\dfrac{11,2}{56}=0,2\left(mol\right)\)
Pt : \(Fe+H_2SO_4\rightarrow FeSO_4+H_2|\)
1 1 1 1
0,2 0,2
\(n_{H2SO4}=\dfrac{0,2.1}{1}=0,2\left(mol\right)\)
\(m_{H2SO4}=0,2.98=19,6\left(g\right)\)
\(m_{ddH2SO4}=\dfrac{19,6.100}{20}=98\left(g\right)\)
\(V_{ddH2SO4}=\dfrac{98}{1,2}\simeq81,67\left(ml\right)\)
Chúc bạn học tốt
nCuO=16/80=0,2(mol)
a) PTHH: CuO + H2SO4 -> CuSO4 + H2O
0,2___________0,2_____0,2(mol)
b) mCuSO4=160.0,2=32(g)
c) mH2SO4=0,2.98=19,6(g)
=>C%ddH2SO4= (19,6/100).100=19,6%
nFe = 11.2/56 = 0.2 (mol)
Fe + H2SO4 => FeSO4 + H2
0.2____0.2_______0.2___0.2
mH2SO4 = 0.2*98 = 19.6 (g)
mdd H2SO4 = 19.6*100/10 = 196 (g)
m dd sau phản ứng = 11.2 + 196 - 0.4 = 206.8 (g)
mFeSO4 = 0.2*152 = 30.4 (g)
C% FeSO4 = 30.4/206.8 * 100% = 14.7%
Vdd H2SO4 = mdd H2SO4 / D = 196 / 1.14 = 171.9 (ml)
CM FeSO4 = 0.2 / 0.1719 = 1.16 M
nFe = 11.2/56 = 0.2 (mol)
Fe + H2SO4 => FeSO4 + H2
0.2____0.2_______0.2___0.2
mH2SO4 = 0.2*98 = 19.6 (g)
mdd H2SO4 = 19.6*100/10 = 196 (g)
m dd sau phản ứng = 11.2 + 196 - 0.4 = 206.8 (g)
mFeSO4 = 0.2*152 = 30.4 (g)
C% FeSO4 = 30.4/206.8 * 100% = 14.7%
Vdd H2SO4 = mdd H2SO4 / D = 196 / 1.14 = 171.9 (ml)
CM FeSO4 = 0.2 / 0.1719 = 1.16 M
\(n_{Al2O3}=\dfrac{10,2}{102}=0,1\left(mol\right)\)
Pt : \(Al_2O_3+6HCl\rightarrow2AlCl_3+3H_2O|\)
1 6 2 3
0,1 0,6 0,1
a) \(n_{HCl}=\dfrac{0,1.6}{1}=0,6\left(mol\right)\)
\(m_{HCl}=0,6.36,5=21,9\left(g\right)\)
\(m_{ddHCl}=\dfrac{21,9.100}{10}=219\left(g\right)\)
b) \(n_{AlCl3}=\dfrac{0,6.2}{6}=0,2\left(mol\right)\)
⇒ \(m_{AlCl3}=0,2.133,5=26,7\left(g\right)\)
c) \(m_{ddspu}=10,2+219=229,2\left(g\right)\)
\(C_{AlCl3}=\dfrac{26,7.100}{229,2}=11,65\)0/0
Chúc bạn học tốt
nAl2O3=10.2:102=0.1(mol)
PTHH:Al2O3+6HCl->2AlCl3+3H2O
theo pthh:nHCl:nAl2O3=6->nHCl=6*0.1=0.6(mol)
mHCl=0.6*36.5=21.9(g)
mdd HCl=21.9*100:14.6=150(g)
theo pthh:nAlCl3:nAl2O3=2->nAlCl3=0.1*2=0.2(mol)
mAlCl3=0.2*133.5=26.7(g)
mdd sau phản ứng:10.2+150=160.2
PTHH: \(2NaOH+H_2SO_4\rightarrow Na_2SO_4+2H_2O\)
Ta có: \(n_{Na_2SO_4}=n_{H_2SO_4}=\dfrac{1}{2}n_{NaOH}=\dfrac{1}{2}\cdot\dfrac{10}{40}=0,125\left(mol\right)\) \(\Rightarrow\left\{{}\begin{matrix}m_{ddH_2SO_4}=\dfrac{0,125\cdot98}{10\%}=122,5\left(g\right)\\m_{Na_2SO_4}=0,125\cdot142=17,75\left(g\right)\end{matrix}\right.\)
\(\Rightarrow C\%_{Na_2SO_4}=\dfrac{17,75}{10+122,5}\cdot100\%\approx13,4\%\)