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Bài 4 :
\(n_{H2}=\dfrac{V_{H2}}{22,4}=\dfrac{3,36}{22,4}=0,15\left(mol\right)\)
Pt : \(2Al+3H_2SO_4\rightarrow Al_2\left(SO_4\right)_3+3H_2|\)
2 3 1 3
0,1 0,15 0,05 0,15
a) \(n_{Al}=\dfrac{0,15.2}{3}=0,1\left(mol\right)\)
⇒ \(m_{Al}=n_{Al}.M_{Al}\)
= 0,1 . 27
= 2,7 (g)
\(m_{Cu}=10-2,7=7,3\left(g\right)\)
0/0Al = \(\dfrac{m_{Al}.100}{m_{hh}}=\dfrac{2,7.100}{10}=27\)0/0
0/0Cu = \(\dfrac{m_{Cu}.100}{m_{hh}}=\dfrac{7,3.100}{10}=13\)0/0
b) \(n_{Al2\left(SO4\right)3}=\dfrac{0,15.1}{3}=0,05\left(mol\right)\)
⇒ \(m_{Al2\left(SO4\right)3}=n_{Al2\left(SO4\right)3.}M_{Al2\left(SO4\right)3}\)
= 0,05 . 342
= 17,1 (g)
\(n_{H2SO4}=\dfrac{0,1.3}{2}=0,15\left(mol\right)\)
⇒ \(m_{H2SO4}=n_{H2SO4}.M_{H2SO4}\)
= 0,15 .98
= 14,7 (g)
\(C_{H2SO4}=\dfrac{m_{ct}.100}{m_{dd}}\Rightarrow m_{dd}=\dfrac{m_{ct}.100}{C}=\)\(\dfrac{14,7.100}{15}=98\left(g\right)\)
mdung dịch sau phản ứng = (mAl + mCu) + mH2SO4 - mH2
= 10 + 98 - (0,15 . 2)
=107,7 (g)
\(C_{Al2\left(SO4\right)3}=\dfrac{m_{ct}.100}{m_{dd}}=\dfrac{17,1.100}{107,7}=15,88\)0/0
Chúc bạn học tốt
Ta có: \(n_{H_2}=\dfrac{5,6}{22,4}=0,25\left(mol\right)\)
\(a.PTHH:\)
\(Mg+2HCl--->MgCl_2+H_2\left(1\right)\)
\(CuO+2HCl--->CuCl_2+H_2O\left(2\right)\)
b. Theo PT(1): \(n_{Mg}=n_{H_2}=0,25\left(mol\right)\)
\(\Rightarrow m_{Mg}=0,25.24=6\left(g\right)\)
\(\Rightarrow m_{CuO}=24,25-6=18,25\left(g\right)\)
c. Ta có: \(n_{CuO}=\dfrac{18,25}{80}=\dfrac{73}{320}\left(mol\right)\)
\(\Rightarrow n_{hh}=\dfrac{73}{320}+0,25=0,478125\left(mol\right)\)
Theo PT(1,2): \(n_{HCl}=2.n_{hh}=2.0,478125=0,95625\left(mol\right)\)
Đổi 300ml = 0,3 lít
\(\Rightarrow C_{M_{HCl}}=\dfrac{0,95625}{0,3}=3,1875M\)
Bài 2 :
Pt : \(CuO+H_2SO_4\rightarrow CuSO_4+H_2O|\)
1 1 1 1
0,2 0,2 0,2
a) \(m_{CuO}=25,6-9,6=16\left(g\right)\)
b) Có : \(m_{CuO}=16\left(g\right)\)
\(n_{CuO}=\dfrac{16}{80}=0,2\left(mol\right)\)
\(n_{CuSO4}=\dfrac{0,2.1}{1}=0,2\left(mol\right)\)
⇒ \(m_{CuSO4}=0,2.160=32\left(g\right)\)
c) \(n_{H2SO4}=\dfrac{0,2.1}{1}=0,2\left(mol\right)\)
⇒ \(m_{H2SO4}=0,2.98=19,6\left(g\right)\)
\(C_{ddH2SO4}=\dfrac{19,6.100}{150}\simeq13,07\)0/0
Chúc bạn học tốt
Bài 1.
\(n_{CH_4}=\dfrac{3,36}{22,4}=0,15mol\)
\(CH_4+2O_2\rightarrow\left(t^o\right)CO_2+2H_2O\)
0,15 0,3 ( mol )
\(V_{O_2}=0,3.22,4=6,72l\)
Bài 2.
\(n_{C_2H_4}=\dfrac{11,2}{26}=0,4mol\)
\(C_2H_4+3O_2\rightarrow\left(t^o\right)2CO_2+2H_2O\)
0,4 1,2 0,8 0,8 ( mol )
\(m_{CO_2}=0,8.44=35,2g\)
\(m_{H_2O}=0,8.18=14,4g\)
\(V_{kk}=1,2.22,4.5=134,4l\)
a)
$2Ca + O_2 \xrightarrow{t^o} 2CaO$
$CaO + H_2O \to Ca(OH)_2$
$Ca(OH)_2 + CO_2 \to CaCO_3 + H_2O$
$CaCO_3 + CO_2 + H_2O \to Ca(HCO_3)_2$
$Ca(HCO_3)_2 \xrightarrow{t^o} CaCO_3 + CO_2 + H_2O$
$Ca(HCO_3)_2 + 2HCl \to CaCl_2 + 2CO_2 + 2H_2O$
$CaCl_2 + Na_2CO_3 \to 2NaCl + CaCO_3$
Chuỗi 3:
(1) \(4FeS_2+11O_2\xrightarrow[]{t^o}2Fe_2O_3+8SO_2\)
(2) \(S+O_2\xrightarrow[]{t^o}SO_2\)
(3) \(SO_2+NaOH\rightarrow NaHSO_3\)
(4) \(2NaHSO_3+Ca\left(OH\right)_2\rightarrow CaSO_3+Na_2SO_3+2H_2O\)
(5) \(CaSO_3+2HCl\rightarrow CaCl_2+H_2O+SO_2\uparrow\)
(6) \(SO_2+\dfrac{1}{2}O_2+H_2O\rightarrow H_2SO_4\)
(7) \(2H_2SO_{4\left(đ\right)}+S\xrightarrow[]{t^o}3SO_2+2H_2O\)
Chuỗi 2:
(1) \(NaCl\xrightarrow[nóng.chảy]{điện.phân}Na+\dfrac{1}{2}Cl_2\)
(2) \(Na+H_2O\rightarrow NaOH+\dfrac{1}{2}H_2\uparrow\)
(3) \(Cl_2+H_2\xrightarrow[]{a/s}2HCl\)
(4) \(Na+\dfrac{1}{2}Cl_2\xrightarrow[]{t^o}NaCl\)
(5) \(NaOH+HCl\rightarrow NaCl+H_2O\)
(6) \(2NaOH+H_2SO_4\rightarrow Na_2SO_4+2H_2O\)
(7) \(2HCl+BaO\rightarrow BaCl_2+H_2O\)
(8) \(Na_2SO_4+BaCl_2\rightarrow2NaCl+BaSO_4\)
a)
(1) \(Fe+2HCl\rightarrow FeCl_2+H_2\uparrow\)
(2) \(Fe+\dfrac{3}{2}Cl_2\xrightarrow[]{t^o}FeCl_3\)
(3) \(FeCl_2+\dfrac{1}{2}Cl_2\rightarrow FeCl_3\)
(4) \(2FeCl_3+Fe\rightarrow3FeCl_2\)
(5) \(FeCl_2+2KOH\rightarrow Fe\left(OH\right)_2+2KCl\)
(6) \(FeCl_3+3KOH\rightarrow Fe\left(OH\right)_3+3KCl\)
(7) \(Fe\left(OH\right)_2\xrightarrow[không.có.Oxi]{t^o}FeO+H_2O\)
(8) \(2Fe\left(OH\right)_3\xrightarrow[]{t^o}Fe_2O_3+3H_2O\)
(9) \(4Fe\left(OH\right)_2+O_2+2H_2O\rightarrow4Fe\left(OH\right)_3\)
(10) \(2FeO+\dfrac{1}{2}O_2\xrightarrow[]{t^o}Fe_2O_3\)
(11) \(Fe_2O_3+3H_2SO_4\rightarrow Fe_2\left(SO_4\right)_3+3H_2O\)
(12) \(Fe_2O_3+3CO\xrightarrow[]{t^o}2Fe+3CO_2\)
(13) \(2FeO+4H_2SO_{4\left(đ\right)}\xrightarrow[]{t^o}Fe_2\left(SO_4\right)_3+SO_2+4H_2O\)
(14) \(FeO+CO\xrightarrow[]{t^o}Fe+CO_2\)
c)
\(Ca+2H_2O\rightarrow Ca\left(OH\right)_2+H_2\uparrow\)
\(Ca\left(OH\right)_2+2HCl\rightarrow CaCl_2+2H_2O\)
\(CaCl_2+K_2CO_3\rightarrow2KCl+CaCO_3\)
\(CaCO_3+CO_2+H_2O\rightarrow Ca\left(HCO_3\right)_2\)
\(Ca\left(HCO_3\right)_2+2KOH\rightarrow CaCO_3+K_2CO_3+2H_2O\)
\(CaCO_3\xrightarrow[]{t^o}CaO+CO_2\)