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\(n_{H_2}=\dfrac{17.92}{22.4}=0.8\left(mol\right)\)
\(n_{Fe_3O_4}=\dfrac{69.6}{232}=0.3\left(mol\right)\)
\(Fe_3O_4+4H_2\underrightarrow{t^0}3Fe+4H_2O\)
\(0.2..............0.8\)
\(m_{Fe_3O_4\left(dư\right)}=\left(0.3-0.2\right)\cdot232=23.2\left(g\right)\)
\(Zn+2HCl\rightarrow ZnCl_2+H_2\)
\(0.8......................................0.8\)
\(m_{Zn}=0.8\cdot65=52\left(g\right)\)
a)\(n_{H_2}=\dfrac{10,08}{22,4}=0,45\left(m\right)\)
\(n_{Fe_2O_3}=\dfrac{48}{160}=0,3\left(m\right)\)
\(PTHH:Fe_2O_3+3H_2\underrightarrow{ }2Fe+3H_2O\)
ta có tỉ lệ:\(\dfrac{0,45}{3}< \dfrac{0,3}{1}->H_2dư\)
H2 còn lại sau phản ứng
\(n_{H_2\left(dư\right)}=0,3-0,15=0,15\left(m\right)\)
\(m_{H_2\left(dư\right)}=0,15.2=0,3\left(g\right)\)
b)\(PTHH:Zn+2HCl\underrightarrow{ }ZnCl_2+H_2\)
tỉ lệ :1 2 1 1
số mol :0,15 0,3 0,15 0,15
\(m_{Zn}=0,15.65=9,75\left(g\right)\)
a, PT: \(2KClO_3\underrightarrow{t^o}2KCl+3O_2\)
Ta có: \(n_{KClO_3}=\dfrac{24,5}{122,5}=0,2\left(mol\right)\)
Theo PT: \(n_{O_2}=\dfrac{3}{2}n_{KClO_3}=0,3\left(mol\right)\)
\(\Rightarrow V_{O_2}=0,3.24,79=7,437\left(g\right)\)
b, PT: \(2Cu+O_2\underrightarrow{t^o}2CuO\)
Ta có: \(n_{Cu}=\dfrac{32}{64}=0,5\left(mol\right)\)
Xét tỉ lệ: \(\dfrac{0,5}{2}< \dfrac{0,3}{1}\), ta được O2 dư.
Theo PT: \(\left\{{}\begin{matrix}n_{O_2\left(pư\right)}=\dfrac{1}{2}n_{Cu}=0,25\left(mol\right)\\n_{CuO}=n_{Cu}=0,5\left(mol\right)\end{matrix}\right.\)
\(\Rightarrow n_{O_2\left(dư\right)}=0,3-0,25=0,05\left(mol\right)\)
\(\Rightarrow m_{O_2\left(dư\right)}=0,05.32=1,6\left(g\right)\)
\(m_{CuO}=0,5.80=40\left(g\right)\)
\(n_{Zn}=\dfrac{m}{M}=\dfrac{3,25}{65}=0,05\left(mol\right)\)
\(PTHH:Zn+2HCl\rightarrow ZnCl_2+H_2\)
1 2 1 1
0,05 0,1 0,05 0,05
a) \(V_{H_2}=n.24,79=0,05.24,79=1,2395\left(l\right)\)
\(m_{ZnCl_2}=n.M=0,05.\left(65+35,5.2\right)=6,8\left(g\right)\)
b) \(PTHH:CuO+H_2\underrightarrow{t^o}Cu+H_2O\)
Ta cos tỉ lệ: \(\dfrac{0,1}{1}>\dfrac{0,05}{1}\Rightarrow\) CuO dư.
Theo ptr, ta có: \(n_{Cu}=n_{H_2}=0,05mol\\ \Rightarrow m_{Cu}=n.M=0,05.64=3,2\left(g\right).\)
a, PT: \(Zn+2HCl\rightarrow ZnCl_2+H_2\)
Ta có: \(n_{Zn}=\dfrac{3,25}{65}=0,05\left(mol\right)\)
THeo PT: \(n_{ZnCl_2}=n_{H_2}=n_{Zn}=0,05\left(mol\right)\)
\(\Rightarrow V_{H_2}=0,05.24,79=1,2395\left(l\right)\)
\(m_{ZnCl_2}=0,05.136=6,8\left(g\right)\)
b, Ta có: \(n_{CuO}=\dfrac{8}{80}=0,1\left(mol\right)\)
PT: \(CuO+H_2\underrightarrow{t^o}Cu+H_2O\)
Xét tỉ lệ: \(\dfrac{0,1}{1}>\dfrac{0,05}{1}\), ta được CuO dư.
Theo PT: \(n_{Cu}=n_{H_2}=0,05\left(mol\right)\Rightarrow m_{Cu}=0,05.64=3,2\left(g\right)\)
a, Ta có:
nZn = 13/65= 0,2(mol)
PTHH: Zn + H2SO4 → ZnSO4 + H2
0,2-----------------------------------0,2
Theo PT : nZnSO4 = 0,2.1/1 = 0,2(mol)
mZnSO4 = 0,2. 161 = 32,2(g)
b, Ta có:
Theo PT : nH2 = 0,2.1/1 = 0,2(mol)
VH2(đktc) = 0,2 . 22,4 = 4,48(l)
CuO+H2-to>Cu+H2O
0,2-----0,2
=>m Cu=0,2.64=12,8g
Cậu ơi cho tớ hỏi ngu tý là cái mà "0,2---------0,2" là ntn vậy ạ :"))?
\(n_{Zn}=\dfrac{19.5}{65}=0.3\left(mol\right)\)
\(n_{H_2SO_4}=\dfrac{98}{98}=1\left(mol\right)\)
\(n_{CuO}=\dfrac{36}{80}=0.45\left(mol\right)\)
\(Zn+H_2SO_4\rightarrow ZnSO_4+H_2\)
\(0.3.....................................0.3\)
\(CuO+H_2\underrightarrow{t^0}Cu+H_2O\)
\(0.3.......0.3.....0.3....0.3\)
\(m_{Cr}=m_{CuO\left(dư\right)}+m_{Cu}=\left(0.45-0.3\right)\cdot80+0.3\cdot64=31.2\left(g\right)\)
\(m_{H_2O}=0.3\cdot18=5.4\left(g\right)\)
Chúc em học tốt !!
Zn+H2SO4→ZnSO4+H2 bạn biến đổi nó ra phương trình này kiểu gì vậy?
PTHH:
4H2+Fe3O4----->3Fe+4H2O
nH2=V/22,4=6,72/22,4=0,3mol
Theo PTHH:4molH2--->3molFe 0,3molH2->0,3.3/4=0,225molFe
mFe=nFe.M=0,225.56=12,6g
nO= nH2O= nH2= 0,3(mol)
m=m(oxit) - mO= 24- 0,3.16= 19,2(g)
$n_{Zn} = \dfrac{6,5}{65} = 0,1(mol) \\ PTHH: Zn + 2HCl \to ZnCl_2 + H_2 \\$$n_{H_2} = n_{Zn} = 0,1(Mol) \\ V_{H_2} = 0,1.22,4 = 2,24l \\b) PTHH: H_2 + CuO \xrightarrow[]{t^o} Cu + H_2O \\ n_{CuO} = \dfrac{12}{64} = 0,15(mol) \\ \to CuO dư$ $\\ n_{H_2} = n_{Cu} = 0,1(mol \\ m_{Cu} = 0,1.64 = 6,4(gam)$