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\(a)n_{H_2}=\dfrac{6,72}{22,4}=0,3mol\\ 2Al+3H_2SO_4\rightarrow Al_2\left(SO_4\right)_3+3H_2\\ 0,2\leftarrow-0,3\leftarrow-0,1\leftarrow---0,3\)
\(a=m_{Al}=0,2.27=5,4g\\ b)m_{Al_2\left(SO_4\right)_3}=0,1.342=34,2g\\ c)C_{\%H_2SO_4}=\dfrac{0,3.98}{100}\cdot100=29,4\%\)
a)nH2=22,46,72=0,3mol2Al+3H2SO4→Al2(SO4)3+3H20,2←−0,3←−0,1←−−−0,3
\(Pt: 2Al+3H_2SO_4 \rightarrow Al_2(SO_4)_3 + 3H_2\)
\(a.n_{H_2}=\dfrac{6,72}{22,4}=0,3\left(mol\right)\)
Theo pt: \(n_{Al}=\dfrac{2}{3}n_{H_2}=0,2\left(mol\right)\)
\(\Rightarrow m_{Al}=a=0,2.27=5,4\left(g\right)\)
\(b.n_{Al_2\left(SO_4\right)_3}=\dfrac{1}{3}n_{H_2}=0,1\left(mol\right)\)
\(\Rightarrow m_{Al_2\left(SO_4\right)_3}=0,1.342=34,2g\)
\(c.\)Theo pt: \(n_{H_2SO_4}=n_{H_2}=0,3\left(mol\right)\)
\(\Rightarrow m_{H_2SO_4}=0,3.98=29,4g\)
\(C_{\%}H_2SO_4=\dfrac{29,4}{100}.100\%=29,4\%\)
a) \(Pt:Fe+H_2SO_4\rightarrow FeSO_4+H_2\)
b) \(n_{Fe}=\dfrac{0,56}{56}=0,01mol\)
Theo pt: \(n_{FeSO_4}=n_{Fe}=0,01mol\)
\(\Rightarrow m_{FeSO_4}=0,01.152=1,52g\)
Theo pt: \(n_{H_2}=n_{Fe}=0,01mol\)
\(\Rightarrow V_{H_2}=0,01.22,4=0,224lít\)
c) \(Theopt:nH_2SO_4=n_{Fe}=0,01mol\)
\(\Rightarrow m_{H_2SO_4}=0,01.98=0,98g\)
\(\Rightarrow m_{ddH_2SO_4}=\dfrac{0,98.100}{19,6}=5g\)
Bài 1:
H2 + O2 → H2O
N2O5 + H2O → HNO3
Bài 4:
Fe2(SO3)3: Sắt III sunfat
Mg(OH)2: Magie hidroxit
H3PO4: axit photphoric
Ba(HSO4)2: Bari Bisunfat
Bài 1 :
\(a.2H_2+O_2\underrightarrow{^{t^0}}2H_2O\)
\(b.N_2O_5+H_2O\rightarrow2HNO_3\)
Bài 2 :
\(n_{Al}=\dfrac{5.4}{27}=0.2\left(mol\right)\)
\(2Al+3H_2SO_4\rightarrow Al_2\left(SO_4\right)_3+3H_2\)
\(0.2............0.3...........0.1..............0.3\)
\(m_{H_2SO_4}=0.3\cdot98=29.4\left(g\right)\)
\(m_{Al_2\left(SO_4\right)_3}=0.1\cdot342=34.2\left(g\right)\)
\(m_{H_2}=0.3\cdot2=0.6\left(g\right)\)
\(V_{H_2}=0.3\cdot22.4=6.72\left(l\right)\)
\(Zn+2HCl\rightarrow ZnCl_2+H_2\)
\(Zn+H_2SO_4\rightarrow ZnSO_4+H_2\)
\(3Zn+2H_3PO_4\rightarrow Zn_3\left(PO_4\right)_2+3H_2\)
1) Fe + H2SO4 --> FeSO4 + H2
2) Zn + 2HCl --> ZnCl2 + H2
3) 2Al + 3H2SO4 --> Al2(SO4)3 + 3H2
4) Zn + H2SO4 --> ZnSO4 + H2
5) Mg + 2HCl --> MgCl2 + H2
6) H2 + CuO --to--> Cu + H2O
7) 2H2 + O2 --to--> 2H2O
`->` Đáp án + Giải thích:
1) Fe + H2SO4 --> FeSO4 + H2
2) Zn + 2HCl --> ZnCl2 + H2
3) 2Al + 3H2SO4 --> Al2(SO4)3 + 3H2
4) Zn + H2SO4 --> ZnSO4 + H2
5) Mg + 2HCl --> MgCl2 + H2
6) H2 + CuO --to--> Cu + H2O
7) 2H2 + O2 --to--> 2H2O
a)
| \(KCl\) | \(HCl\) | \(K_2SO_4\) | \(H_2SO_4\) | |
| Quỳ tím | _ | đỏ | _ | đỏ |
| \(BaCl_2\) | _ | _ | \(\downarrow\)trắng | \(\downarrow\)trắng |
\(BaCl_2+K_2SO_4\rightarrow BaSO_4+2KCl\\ BaCl_2+H_2SO_4\rightarrow BaSO_4+2HCl\)
b)
| \(KNO_3\) | \(Na_2SO_4\) | \(NaOH\) | \(Ca\left(OH\right)_2\) | |
| quỳ tím | _ | _ | xanh | xanh |
| \(Ba\left(NO_3\right)_2\) | _ | ↓trắng | _ | _ |
| \(CO_2\) | _ | \(\downarrow\)trắng |
\(Ba\left(NO_3\right)_2+Na_2SO_4\rightarrow BaSO_4+2NaNO_3\\ CO_2+Ca\left(OH\right)_2\rightarrow CaCO_3+H_2O\)
Sửa đề : oxi -> Ca
nCa=m/M=24/40=0,6(mol)
PT: Ca +H2SO4 -> CaSO4 +H2
vậy: 0,6--->0,6-------->0,6--->0,6(mol)
=> VH2=n.22,4=0,6.22,4=13,44(lít)
b) mH2SO4=n.M=0,6.98=58,8(g)
c) mCaSO4=n.M=0,6.136=81,6(g)
bạn ơi tại sao cho oxi t/d vói H2SO4 ma tạo ra CaSO4
Chắc đề là cho 24 (g) Ca thì làm như sau :
nCa=24/40=0,6(mol)
pt: Ca+H2SO4--->CaSO4+H2
Theo pt : nH2=nH2SO4=nCaSO4=nCa=0,6(mol)
=>VH2=0,6.22,4=13,44(l0
=>mH2SO4=0,6.98=58,8(g)
=>mcaSO4=0,6.136=81,6(g)
p/s: Chúc bạn học tốt ...^^
CH4+2 O2 ---to-->.......CO2+2H2O
4P + 5O2--to---->...2P2O5.....
SO3+H2O...-------> H2SO4
P2O5+3H2O->2H3PO4
2KMnO4 ---to----->......K2MNO4...+......MnO2..+..O2.....
2KClO3-------->..2KCl.......+...3.O2...
\(CH_4+2O_2\underrightarrow{t^o}CO_2+2H_2O\\ 4P+5O_2\underrightarrow{t^o}2P_2O_5\\ P_2O_5+3H_2O\rightarrow2H_3PO_4\\ 2KMnO_4\underrightarrow{t^o}K_2MnO_4+MnO_2+O_2\\ 2KCl\xrightarrow[xtMnO_2]{t^o}2KCl+3O_2\)
\(n_{H_2}=\dfrac{33,6}{22,4}=1,5\left(mol\right)\\ m_{H_2}=1,5.2=3\left(g\right)\)
PTHH : 2Al + H2SO4 -> Al2SO4 + H2
Theo ĐLBTKL
\(m_{Al}+m_{H_2SO_4}=m_{Al_2SO_4}+m_{H_2}\\ \Rightarrow m_{H_2SO_4}=\left(171+3\right)-2,7=171,3\left(g\right)\)
pthh: 2Al+3H\(_2\)SO\(_4\)→Al\(_2\)(SO4)\(_3\)+3H\(_2\)↑
nH\(_2=33,6:22,4=1,5\left(mol\right)\)
\(mH_2=1,5.2=3\left(g\right)\)
\(nAl_2\left(SO_4\right)=171:150=1,14\left(mol\right)\)
\(mAl_2\left(SO_4\right)_3=1,14.342=389,88\left(g\right)\)
BTKL : mAl + mH\(_2\)SO\(_4\) = m Al\(_2\)(SO4)\(_3\) + m H\(_2\)
2,7 + mH\(_2\)SO\(_4\) = 389,88 + 3
=> \(mH_2SO_4=\left(389,88+3\right)-2,7=390,18\left(g\right)\)