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a)
$n_{Nito} = \dfrac{6,02.10^{23}}{6,02.10^{23}} = 1(mol)$
$m_{Nito} = 1.14 = 14(gam)$
b)
$n_{Cl} = \dfrac{6,02.10^{23}}{6,02.10^{23}} = 1(mol)$
$m_{Cl} = 1.35,5 = 35,5(gam)$
c)
$n_{H_2O} = \dfrac{6,02.10^{23}}{6,02.10^{23}} = 1(mol)$
$m_{H_2O} = 1.18 = 18(gam)$
a) \(n_{N_2}=\dfrac{6,02.10^{23}}{6,02.10^{23}}=1\left(mol\right)\)
=> \(m_{N_2}=1.28=28\left(g\right)\)
b) \(n_{Cl_2}=\dfrac{6,02.10^{23}}{6,02.10^{23}}=1\left(mol\right)\)
=> \(m_{Cl_2}=1.35,5.2=71\left(g\right)\)
c) \(n_{H_2O}=\dfrac{6,02.10^{23}}{6,02.10^{23}}=1\left(mol\right)\)
=> \(m_{H_2O}=1.18=18\left(g\right)\)
d) \(n_{CaCO_3}=\dfrac{6,02.10^{23}}{6,02.10^{23}}=1\left(mol\right)\)
=> \(m_{CaCO_3}=1.100=100\left(g\right)\)
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\(n_{Fe_2O_3}=\dfrac{24}{160}=0,15\left(mol\right)\)
PTHH :Fe2O3 + 3H2 --to-> 2Fe + 3H2O
0,15 0,45 0,3
\(V_{O_2}=0,45.22,4=10,08\left(l\right)\)
\(m_{Fe}=0,3.56=16,8\left(g\right)\)
Chọn D
\(n_{Fe_2O_3}=\dfrac{24}{160}=0,15\left(mol\right)\)
PTHH: Fe2O3 + 3H2 --to--> 2Fe + 3H2O
0,15-->0,45------>0,3
V = 0,45.22,4 = 10,08 (l)
m = 0,3.56 = 16,8 (g)
=> D
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Câu 1 em mở SGK nha
Câu 2:
a) Fe2O3 + 3 H2 -to-> 2 Fe + 3 H2O
b) HgO + H2 -to->Hg + H2O
c)PbO + H2 -to-> Pb + H2O
Câu 3:
nHgO= 21,7/217=0,1(mol)
PTHH: HgO + H2 -to-> Hg + H2O
0,1________0,1_______0,1(mol)
a) nHg= 0,1.201=20,1(g)
b)mH2=0,1.2=0,2(g)
V(H2,đktc)=0,1.22,4=2,24(l)
4)
nH2= 8,4/22,4=0,375(mol)
PTHH: H2 + 1/2 O2 -to-> H2O
0,375__________________0,375
=>mH2O=0,375.18= 6,75(g)
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bạn bấm máy tính hoặc giải hệ:
\(\left\{{}\begin{matrix}27x+56y=11\\1,5x+y=0,4\end{matrix}\right.\) \(\Leftrightarrow\left\{{}\begin{matrix}27x+56y=11\\84x+56y=22,4\end{matrix}\right.\)
\(\Leftrightarrow\left\{{}\begin{matrix}57x=11,4\\27x+56y=11\end{matrix}\right.\) \(\Leftrightarrow\left\{{}\begin{matrix}x=0,2\\27.0,2+56y=11\end{matrix}\right.\)
\(\Leftrightarrow\left\{{}\begin{matrix}x=0,2\\y=0,1\end{matrix}\right.\)
![](https://rs.olm.vn/images/avt/0.png?1311)
PTHH: 2KMnO4 \(\underrightarrow{t^o}\) K2MnO4 + MnO2 + O2\(\uparrow\)
\(n_{KMnO_4}=\dfrac{23,7}{158}=0,15mol\)
\(n_{O_2}=\dfrac{0,15}{2}=0,075mol\\ V_{O_2}=0,075.22,4=1,68l\)
\(\Rightarrow\) Đáp án A
Câu 28:
2Al + 6HCl \(\rightarrow\) 2AlCl3 + 3H2\(\uparrow\)
\(n_{H_2}=\dfrac{6,72}{22,4}=0,3mol\\ n_{Al}=\dfrac{0,3.2}{3}=0,2mol\\ m_{Al}=0,2.27=5,4g\)
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Chất X : KMnO4
Chất X phải là chất giàu oxi và dễ bị phân hủy ở nhiệt độ cao .
PTHH :
\(2KMnO_4\underrightarrow{t^o}K_2MnO_4+MnO_2+O_2\uparrow\)
8/9 ___________________ 4/9
Số mol Oxi cần thu :
\(n_{O_2}=\dfrac{V}{22,4}=\dfrac{8,96:90\%}{22,4}=\dfrac{4}{9}\left(mol\right)\)
Số gam chất X cần để thu đc 8,96 l khí Oxi là :
\(m=n.M=\dfrac{8}{9}.158\approx140,44\left(g\right)\)
$4Al+3O_2\xrightarrow{t^o}2Al_2O_3$
$n_{O_2}=\dfrac{V}{22,4}=\dfrac{6,72}{22,4}=0,3(mol)$
Theo PT: $n_{Al}=\dfrac{4}{3}n_{O_2}=0,4(mol)$
$\Rightarrow m_{Al}=n.M=0,4.27=10,8(g)$