Hoàn thiên PTHH
a) ZnO + HNO3 ---> H2OO + Zn(NO3)2
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a) \(4K+O_2\underrightarrow{t^o}2K_2O\)
b) \(Zn+2HCl->ZnCl_2+H_2\uparrow\)
c) \(CaO+2HNO_3->Ca\left(NO_3\right)_2+H_2O\)
d) \(2H_2+O_2\underrightarrow{t^o}2H_2O\)
1) H2SO4 + 2NaOH -> Na2SO4 + 2H2O.
2) H2SO4 + Mg(OH)2-> Mg(OH)2 +2H2O.
3)2HNO3 + Zn(OH)3 -> Zn(NO3)2 + 2H2O.
1. \(H_2SO_4\)+ NaOH --> \(Na_2SO_4\)+ \(H_2O\)
\(H_2SO_4\)+ 2NaOH --> \(Na_2SO_4\)+\(H_2O\)
\(H_2SO_4\)+ 2NaOH \(\rightarrow\) \(Na_2SO_4\)+2\(H_2O\)
2. \(H_2SO_4\)+ \(Mg\left(OH_2\right)\)--> \(MgSO_4\)+\(H_2O\)
\(H_2SO_4\)+\(Mg\left(OH_2\right)\)\(\rightarrow\) \(MgSO_4\)+2\(H_2O\)
3. \(HNO_3\)+\(Zn\left(OH\right)_3\)-->\(Zn\left(NO_3\right)_2\)+\(H_2O\)
2\(HNO_3\)+\(Zn\left(OH\right)_3\)-->\(Zn\left(NO_3\right)_2\)+\(H_2O\)
2\(HNO_3\)+\(Zn\left(OH\right)_3\)\(\rightarrow\)\(Zn\left(NO_3\right)_2\)+2\(H_2O\)
$Na_2S + 2HCl \to H_2S + 2NaCl$
$2KOH + H_2SO_4 \to K_2SO_4 + 2H_2O$
$Ba(NO_3)_2 + H_2SO_4 \to BaSO_4 + 2HNO_3$
$NaOH + HCl \to NaCl + H_2O$
$MgSO_4 + Ba(NO_3)_2 \to BaSO_4 + Mg(NO_3)_2$
$AgNO_3 + HCl \to AgCl + HNO_3$
Na2S+2HCl→H2S+2NaClNa2S+2HCl→H2S+2NaCl
2KOH+H2SO4→K2SO4+2H2O2KOH+H2SO4→K2SO4+2H2O
Ba(NO3)2+H2SO4→BaSO4+2HNO3Ba(NO3)2+H2SO4→BaSO4+2HNO3
NaOH+HCl→NaCl+H2ONaOH+HCl→NaCl+H2O
MgSO4+Ba(NO3)2→BaSO4+Mg(NO3)2MgSO4+Ba(NO3)2→BaSO4+Mg(NO3)2
AgNO3+HCl→AgCl+HNO3
1.Al\(\rightarrow\)Al+3 +3e_______________.(5x-2y)
xN+5 +(5x-2y)e\(\rightarrow\)xN+\(\frac{2y}{x}\)______.3
\(\rightarrow\)(5x-2y)Al+(18x-6y)HNO3\(\rightarrow\)(5x-2y)Al(NO3)3+3NxOy+(9x-3y)H2O
2.M\(\rightarrow\)M+n +ne____.2
S+6 +2e\(\rightarrow\)S+4_____.n
\(\rightarrow\)2M+3nH2SO4\(\rightarrow\)2M(SO4)n+nSO2+3nH2O
3.M\(\rightarrow\)M+n +ne__________.(5x-2y)
xN+5 +(5x-2y)e\(\rightarrow\)xN+\(\frac{2y}{x}\) ____.n
\(\rightarrow\)(5x-2y)M+(6nx-2ny)HNO3\(\rightarrow\)(5x-2y)M(NO3)n+nNxOy+(3nx-ny)H2O
N+5 +3e\(\rightarrow\)N+2 __________.1
2N+5 +8e\(\rightarrow\)2N+1_________ .2
\(\rightarrow\)5N+5 +19e\(\rightarrow\)N+2 +4N+1______ .2
Zn\(\rightarrow\)Zn+2 +2e ____________ .19
\(\rightarrow\)19Zn+48HNO3\(\rightarrow\)19Zn(NO3)2+2NO+4N2O+24H2O
2N+5 +10e\(\rightarrow\)2N0 .2
2N+5+ 8e\(\rightarrow\)2N+1 .1
\(\rightarrow\)6N+5 +28e\(\rightarrow\)4N0 +2N+1 .3
Al\(\rightarrow\)Al+3 +3e _________.28
\(\rightarrow\)28Al+102HNO3\(\rightarrow\)28Al(NO3)3+6N2+3N2O+51H2O
2Fe+2 \(\rightarrow\)2Fe+3 +2e .5
Mn+7 +5e\(\rightarrow\)Mn+2 .2
\(\rightarrow\)10FeSO4+2KMnO4+2KHSO4\(\rightarrow\)5Fe2(SO4)3+2MnSO4+2K2SO4+H2O
4. (5x-2y)AL + (18x-6y)HNO3 -------> (5x-2y)AL(NO3)3 + 3NxOy +(9x-3y)H2O
5. 2M + 2nH2SO4--------> M2(SO4)n + nSO2 + 2nH2O
6. (5x-2y)M + (6nx-2ny)HNO3 -------->(5x-2y) M(NO3)n +n NxOy + (3nx-ny)H2O
7. 11Zn + 28HNO3 -------> 11Zn( NO3)2 + 2NO + 2N2O + 14H2O
8. 46AL + 168HNO3 -------;> 46AL( NO3)3 + 9N2 + 6N2O + 84H2O
9. 10FeSO4 + 2KMnO4 + 16KHSO4 ---> 5Fe2(SO4)3 +9 K2SO4 + 2MnSO4 + 8H2O.
nZn(NO3)2 = 0,6
nNH4NO3 = 0,1
Áp dụng định luật bảo toàn e có: 2nZn = 8nNH4NO3 ⇒ nZn = 0,4
⇒ nZnO = nZn(NO3)2 – nZn = 0,6 – 0,4 =0,2
⇒ %mZn = mZn ÷ mX .100% = 61,61%
Đáp án C.
4Zn + 10HNO3 → 4Zn(NO3)2 + NH4NO3 + 3H2O
K2Cr2O7 + 14HCl → 2KCl + 2CrCl3 + 3Cl2 + 7H2O
Cân bằng
a) 4 : 10 : 4 : 1 : 3
b) 1 : 14 : 2 : 2 : 3 : 7
ZnO + 2HNO3–—–> H2O + Zn(NO3)2
Bỏ 1 Oxi vế Phải mn nhé giúp e trc 10h