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1)
\(2Cu+O_2\rightarrow2CuO\)
a)\(n_{Cu}=\frac{2.56}{64}=0.04\left(mol\right)\)
\(\Rightarrow n_{CuO}=\frac{2}{2}\cdot n_{Cu}=\frac{2}{2}\cdot0.04=0.04\left(mol\right)\)
\(\Rightarrow m_{CuO}=0.04\cdot80=3.2\left(g\right)\)
2)
\(n_{CuO}=\frac{24}{80}=0.3\left(mol\right)\)
\(n_{Cu}=\frac{2}{2}\cdot n_{Cu}=\frac{2}{2}\cdot0.3=0.3\left(mol\right)\)
\(\Rightarrow m_{Cu}=0.3\cdot64=19.2\left(mol\right)\)
\(n_{O_2}=\frac{1}{2}\cdot n_{CuO}=\frac{1}{2}\cdot0.3=0.15\left(mol\right)\)
\(\Rightarrow m_O=0.15\cdot32=4.8\left(g\right)\)
Bài 1:
PTHH: CuO + H2SO4 → CuSO4 + H2O
\(n_{CuO}=\dfrac{1,6}{80}=0,02\left(mol\right)\)
\(n_{H_2SO_4}=\dfrac{20}{98}=\dfrac{10}{49}\left(mol\right)\)
Theo PT: \(n_{CuO}=n_{H_2SO_4}\)
Theo bài: \(n_{CuO}=\dfrac{49}{500}n_{H_2SO_4}\)
Vì \(\dfrac{49}{500}< 1\) ⇒ H2SO4 dư
Theo PT: \(n_{CuSO_4}=n_{CuO}=0,02\left(mol\right)\)
\(\Rightarrow m_{CuSO_4}=0,02\times160=3,2\left(g\right)\)
Bài 2:
PTHH: Al2O3 + 6HCl → 2AlCl3 + 3H2O
a) \(n_{Al_2O_3}=\dfrac{30,6}{102}=0,3\left(mol\right)\)
\(n_{HCl}=\dfrac{9\times10^{22}}{6\times10^{23}}=0,15\left(mol\right)\)
Theo PT: \(n_{Al_2O_3}=\dfrac{1}{6}n_{HCl}\)
Theo bài: \(n_{Al_2O_3}=2n_{HCl}\)
Vì \(2>\dfrac{1}{6}\) ⇒ Al2O3 dư
Theo PT: \(n_{Al_2O_3}pư=\dfrac{1}{6}n_{HCl}=\dfrac{1}{6}\times0,15=0,025\left(mol\right)\)
\(\Rightarrow n_{Al_2O_3}dư=0,3-0,025=0,275\left(mol\right)\)
\(\Rightarrow m_{Al_2O_3}dư=0,275\times102=28,05\left(g\right)\)
b) Theo PT: \(n_{AlCl_3}=\dfrac{1}{3}n_{HCl}=\dfrac{1}{3}\times0,15=0,05\left(mol\right)\)
\(\Rightarrow m_{AlCl_3}=0,05\times98=4,9\left(g\right)\)
Bạn tham khảo câu này ha nếu k cân bằng dc PTHH thì ns với mk nhé https://hoc24.vn/hoi-dap/question/679693.html?pos=1869014
2,
a, SO\(_3\) : \(H_2SO_4\)
\(P_2O_5:H_3PO_4\)
\(N_2O_5:HNO_3\)
\(CO_2:H_2CO_3\)
b, \(Fe_2O_3:Fe\left(OH\right)_3\)
\(K_2O:KOH\)
\(CuO:Cu\left(OH\right)_2\)
\(BaO:Ba\left(OH\right)_2\)
a)
(left(1 ight)2KMnO_4underrightarrow{t^o}K_2MnO_4+MnO_2+O_2\ left(2 ight)O_2+2Znunderrightarrow{t^o}2ZnO\ left(3 ight)ZnO+2HCl ightarrow ZnCl_2+H_2O\left(4 ight) 2O_2+3Feunderrightarrow{t^o}Fe_3O_4\ left(5 ight)Fe_3O_4+H_2underrightarrow{t^o}Fe+H_2O\ left(6 ight)Fe+H_2SO_4 ightarrow FeSO_4+H_2)
b)
(left(1 ight)2H_2Ounderrightarrow{đp}2H_2+O_2\ left(2 ight)O_2+2Cuunderrightarrow{t^o}2CuO\ left(3 ight)CuO+H_2underrightarrow{t^o}Cu+H_2O\ left(4 ight)2H_2Ounderrightarrow{đp}2H_2+O_2\ left(5 ight)H_2+FeOunderrightarrow{t^o}Fe+H_2O\ left(6 ight)3Fe+2H_3PO_4 ightarrow Feleft(PO_4 ight)_2+3H_2)
\(2KMnO_4\underrightarrow{t^0}K_2MnO_2+MnO_2+O_2\)
\(Zn+O_2\underrightarrow{t^0}ZnO\)
\(Zn+2HCl\underrightarrow{t^0}ZnCl_2+H_2\)
\(3Fe+2O_2\underrightarrow{t^0}Fe_3O_4\)
\(4H_2 +Fe_3O_4\underrightarrow{t^0}3Fe+4H_2O\)
\(Fe+H_2SO_4\underrightarrow{t^0}FeSO_4+H_2\)
2)
1.2Na + 2H2O ---.>2NaOH+H2
2.CO2 + H2O --->H2CO3
3. P2O5 + 3H2O--->2H3PO4
4. BaO + H2O--->Ba(OH)2
5. Fe3O4 + 4H2 --->3Fe+4H2O
6. CuO + H2 --->Cu+H2O
7. 2Al + 6HCl --->2AlCl3+3H2
8. Fe + H2SO4 --->FeSO4+H2
Oxit axit:
P2O5:Diphotpho pentaoxit
CO2:cacbon dioxit
Axit:
HNO3: Axit nitric
H2SO4: axit sunfuric
Hcl: axit clohidric
H2S:Hidro sunfua
H2SO3:Axit sunfuro
H3PO4: Axit photphoric
Bazơ:
Fe(OH)2
Al(OH)3
Ca(OH)2
KOH
Oxit bazơ
FeO
CaO
CuO
Muối:
CuCO3
K2HPO4
CuSO4
AgNO3
Ca(HPO4)2
P.ứ d có nhiệt độ nha