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1) 2SO2 + O2 → 2SO3
2) N2O5 + H2O → 2HNO3
3) Al2(SO4)3 + 6AgNO3 → 2Al(NO3)3 + 3Ag2SO4
4) Al2(SO4)3 + 6NaOH → 2Al(OH)3 + 3Na2SO4
5) CaO + CO2 → CaCO3
6) CaO + H2O → Ca(OH)2
7) CaCO3 + H2O + CO2 → Ca(HCO3)2
8) 4Na + 2H3PO4 → 2Na2HPO4 + H2
9) 6Na + 2H3PO4 → 2Na3PO4 + 3H2
10) 2Na + 2H3PO4 → 2NaH2PO4 + H2
\(4P+5O_2\rightarrow\left(t^o\right)2P_2O_5\\ Ca\left(OH\right)_2+CO_2\rightarrow CaCO_3\downarrow+H_2O\\ 2K+2H_2O\rightarrow2KOH+H_2\uparrow\\ Fe+2HCl\rightarrow FeCl_2+H_2\uparrow\\ 2Al+3H_2SO_4\rightarrow Al_2\left(SO_4\right)_3+3H_2\uparrow\\ Fe+S\rightarrow\left(t^o\right)FeS\\ 2Al\left(OH\right)_3\rightarrow\left(t^o\right)Al_2O_3+3H_2O\\ 2HgO\rightarrow\left(450^oC-500^oC\right)2Hg+O_2\uparrow\\ CuCl_2+2KOH\rightarrow Cu\left(OH\right)_2\downarrow+2KCl\\ Cu\left(OH\right)_2\rightarrow\left(t^o\right)CuO+H_2O\)
1. `4P + 5O_2 -> 2P_2O_5`
2.`Ca(OH)_2 + CO_2 -> CaCO_3 \downarrow + H_2O`
3. `2K +2 H_2O -> 2KOH + H_2 \uparrow`
4. `Fe + 2HCl -> FeCl_2 + H_2 \uparrow`
5. `2Al + 3H_2SO_4 -> Al_2(SO_4)_3 + 3H_2 \uparrow`
6. `Fe + S -> FeS`
7. `2Al(OH)_3 -> Al_2O_3 + 3H_2O`
8. `2HgO -> 2Hg + O_2 \uparrow`
9. `CuCl_2 + 2KOH -> Cu(OH)_2\downarrow + 2KCl`
10. `Cu(OH)_2 ->CuO + H_2O`
1: CaCl2 + 2AgNO3 ---> 2AgCl + Ca(NO3)2
2: 2Al + 3H2SO4 ---> Al2(SO4)3 + 3H2
3: P2O5 + 3H2O ---> 2H3PO4
4: 4FeO + O2 ---> 2Fe2O3
Câu 2:
MCaCO3 = 100(g/mol)
%Ca = \(\dfrac{40}{100}.100\%\)= 40%
%C = \(\dfrac{12}{100}.100\)% = 12%
%O = \(\dfrac{3.16}{100}\).100% = 48%
Câu 3:
nCO2 = \(\dfrac{5,6}{22,4}\)= 0,25 mol => mCO2 = 0,25.44 = 11 gam
nCO2 = \(\dfrac{9.10^{23}}{6,022.10^{23}}\)≃ 1,5 mol => mCO2 = 1,5. 44 = 66 gam
Câu 4:
2Al + 6HCl --> 2AlCl3 + 3H2
nAl = 2,7/27 = 0,1 mol. Theo tỉ lệ phản ứng => nAlCl3 = nAl = 0,1 mol
=> mAlCl3 = 0,1.133,5 = 13,35 gam
\(Fe+2HCl\rightarrow FeCl_2+H_2\)
\(2Al+3H_2SO_4\rightarrow Al_2\left(SO_4\right)_3+3H_2\)
\(CuO+H_2SO_4\rightarrow CuSO_4+H_2O\)
\(2Al\left(OH\right)_3+3H_2SO_4\rightarrow Al_2\left(SO_4\right)_3+6H_2O\)
\(CuO+2HNO_3\rightarrow Cu\left(NO_3\right)_2+H_2O\)
1. Fe + 2HCl → FeCl2 + H2
2Al + 3H2SO4 → Al2(SO4)3 + 3H2
CuO + H2SO4 → CuSO4 + H2O
2Al(OH)3 + 3H2SO4 → Al2(SO4)3 + 6H2O
CuO + 2HNO3 → Cu(NO3)2 + H2O
\(M_{CaCO_3}=40+12+16.3=100\left(\dfrac{g}{mol}\right)\\ \%m_{Ca}=\dfrac{40}{100}.100\%=40\%\\ \%m_C=\dfrac{12}{100}.100\%=12\%\\ \%m_O=100\%-\left(12\%+40\%\right)=48\%\\ M_{Al_2\left(SO_4\right)_3}=27.2+\left(32+16.4\right).3=342\left(\dfrac{g}{mol}\right)\\ \%m_{Al}=\dfrac{2.27}{342}.100\%=15,79\%\\ \%m_S=\dfrac{32.3}{342}.100\%=28\%\\ \%m_O=100\%-\left(28\%+15,79\%\right)=56,21\%\)
1.
| 2Fe+2 ---> 2Fe+3 + 1e | x1 |
| S+6 + 2e ---> S+4 | x1 |
2FeO + 4H2SO4 ---> Fe2(SO4)3 + SO2 + 4H2O
2.
| 2Fe+2 ---> 2Fe+3 + 2e | x1 |
| S+6 + 2e ---> S+4 | x1 |
2FeCO3 + 4H2SO4 ---> Fe2(SO4)3 + 2CO2 + SO2 + 4H2O
3.
| 2Fe+2 ---> 2Fe+3 + 2e | x1 |
| S+6 + 2e ---> S+4 | x1 |
2FeSO4 + 2H2SO4 ---> Fe2(SO4)3 + SO2 + 2H2O
4.
| 2Fe+2 ---> 2Fe+3 + 2e | x4 |
| S+6 + 8e ---> S-2 | x1 |
8Fe(OH)2 + 13H2SO4 ---> 4Fe2(SO4)3 + H2S + 20H2O
5.
| Al0 ---> Al+3 + 3e | x10 |
| 2N+5 ---> 2N0 | x3 |
10Al + 36HNO3 ---> 10Al(NO3)3 + 3N2 + 18H2O
1. 2Al + 3H2SO4 -----> Al2(SO4)3 + 3H2
2. Ca(NO3)2 + Na2CO3 -------> CaCO3 + 2NaNO3
\(2Al+3H_2SO_4\rightarrow Al_2\left(SO_4\right)_3+3H_2\)
\(Ca\left(NO_3\right)_2+Na_2CO_3\rightarrow CaCO_3+2NaNO_3\)