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C+O2to-->CO2
0,3--0,3--0,3
nC = 3,6 / 12 = 0,3 (mol)
=> VCO2(đktc) = 0,3 x 22,4 =6,72lít
=>Vkk=6,72\5=33,6l
PTHH: \(C+O_2\underrightarrow{t^o}CO_2\)
a) Ta có: \(n_C=\dfrac{3,6}{12}=0,3\left(mol\right)=n_{CO_2}\)
\(\Rightarrow V_{CO_2}=0,3\cdot22,4=6,72\left(l\right)\)
b) Theo PTHH: \(n_{O_2}=n_C=0,3mol\)
\(\Rightarrow V_{O_2}=6,72\left(l\right)\) \(\Rightarrow V_{kk}=6,72\cdot5=33,6\left(l\right)\)
a, \(Zn+2HCl\rightarrow ZnCl_2+H_2\)
b, \(n_{Zn}=\dfrac{6,5}{65}=0,1\left(mol\right)\)
Theo PT: \(n_{ZnCl_2}=n_{H_2}=n_{Zn}=0,1\left(mol\right)\)
\(\Rightarrow V_{H_2}=0,1.22,4=2,24\left(l\right)\)
\(m_{ZnCl_2}=0,1.136=13,6\left(g\right)\)
c, \(CuO+H_2\underrightarrow{t^o}Cu+H_2O\)
Theo PT: \(n_{Cu}=n_{H_2}=0,1\left(mol\right)\Rightarrow m_{Cu}=0,1.64=6,4\left(g\right)\)
\(n_{ZnO}=\dfrac{m}{M}=\dfrac{16,2}{65+16}=0,2\left(mol\right)\)
a) \(PTHH:Zn+H_2O\rightarrow ZnO+H_2\)
1 1 1 1
0,2 0,2 0,2 0,2
b) \(V_{H_2}=n.24,79=0,2.24,79=4,958\left(l\right)\)
c) \(m_{Zn}=n.M=0,2.65=13\left(g\right).\)
PTHH: \(2Mg+O_2\underrightarrow{t^o}2MgO\)
Gộp cả phần a và b
Ta có: \(n_{Mg}=\dfrac{12}{24}=0,5\left(mol\right)\)
\(\Rightarrow\left\{{}\begin{matrix}n_{O_2}=0,25mol\\n_{MgO}=0,5mol\end{matrix}\right.\) \(\Rightarrow\left\{{}\begin{matrix}m_{O_2}=0,25\cdot22,4=5,6\left(l\right)\\m_{MgO}=0,5\cdot40=20\left(g\right)\end{matrix}\right.\)
nK=0,2(mol)
PTHH: 4K + O2 -to-> 2 K2O
nK2O= 0,1(mol) => mK2O=0,1.94=9,4(g)
nO2=0,05(mol) -> V(O2,đktc)=0,05.22,4=1,12(l)
V(kk,dktc)=5.V(O2,dktc)=5.1,12=5,6(l)
a)
\(2Zn\left(NO_3\right)_2\rightarrow2ZnO+4NO_2+O_2\)
\(n_{Zn\left(NO3\right)2}=\frac{47,25}{189}=0,25\left(mol\right)\)
b)
\(n_{ZnO}=n_{Zn\left(NO3\right)2}=0,25\left(mol\right)\)
\(\Rightarrow m_{ZnO}=0,25.81=20,25\left(g\right)\)
c)
Theo PTHH:
\(n_{O2}=n_{Zn\left(NO3\right)2}=\frac{0,25}{2}=0,125\left(mol\right)\)
\(\Rightarrow V_{O2}=0,125.22,4=2,8\left(l\right)\)
2Zn(NO3)2----->2ZnO+2NO2+3O2
b) n Zn(NO3)2=47,25/189=0,25(mol)
n ZnO=n Zn(NO3)2=0,25(mol)
m ZnO=0,25.81=20,25(g)
c) n O2=3/2n Zn(NO3)2=0,375(mol)
V O2=0,375.22,4=8,4(l)