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\(n_{Fe}=\dfrac{11,2}{56}=0,2(mol)\\ a,Fe+2HCl\to FeCl_2+H_2\\ b,n_{FeCl_2}=n_{H_2}=n_{Fe}=0,2(mol)\\ \Rightarrow V_{H_2}=0,2.22,4=4,48(l)\\ m_{FeCl_2}=0,2.127=25,4(g)\)
a. PTHH : Fe + HCl -> FeCl2 + H2
b) \(n_{Fe}=\dfrac{28}{56}=0,5\left(mol\right)\)
\(n_{FeCl_2}=\dfrac{0,5}{2}=0,25\left(mol\right)\\ m_{FeCl_2}=0,25.127=31,75\left(g\right)\)
c) \(n_{H_2}=\dfrac{0,5}{1}=0,5\left(mol\right)\\ V_{H_2}=0,5.22,4=11,2\left(l\right)\)
Mà thể tích tối đa là 10 l -> quả bóng k chứa được hết lượng H2 thoát ra ngoài
\(Fe+2HCl\rightarrow FeCl_2+H_2\)
\(n_{Fe}=0,1\left(mol\right)\)
a, \(m_{FeCl_2}=0,1.\left(56+35,5.2\right)=12,7\left(g\right)\)
b, \(V_{H_2}=0,1.22,4=2,24\left(l\right)\)
\(n_{Fe}=\dfrac{28}{56}=0,5mol\)
a, PTHH : \(Fe + 2HCl-> FECl_2+ H_2↑\)
0,5 0,5 0,5 (mol)
b/. Theo phương trình, ta có:
\(n_{FeCl_2}=n_{Fe}=0,5 mol\)
\(m_{FeCl_2}=0,5.127=63,5g\)
c, Thông cảm không biết làm
\(a,PTHH\left(1\right):Fe+2HCl\rightarrow FeCl_2+H_2\uparrow\)
\(b,n_{Fe}=\dfrac{m}{M}=\dfrac{28}{56}=0,5\left(mol\right)\\ Theo.PTHH\left(1\right):n_{FeCl_2}=n_{Fe}=0,5\left(mol\right)\\ m_{FeCl_2}=n.M=0,5.91,5=45,75\left(g\right)\)
\(c,PTHH\left(2\right):2Mg+O_2\underrightarrow{t^o}2MgO\\ n_{Mg}=\dfrac{m}{M}=\dfrac{4,8}{24}=0,2\left(mol\right)\\ Theo.PTHH\left(2\right):n_{O_2}=2.n_{Mg}=0,2.2=0,4\left(mol\right)\\ V_{O_2\left(đktc\right)}=n.22,4=0,4.22,4=8,96\left(l\right)\)
(c lỗi đề à có oxi chứ ko có hidro nên mik thay bằng oxi nha)
\(n_{Fe}=\dfrac{22,4}{56}=0,4\left(mol\right)\\ PTHH:Fe+2HCl\rightarrow FeCl_2+H_2\\ n_{H_2}=n_{FeCl_2}=n_{Fe}=0,4\left(mol\right)\\ a,V_{H_2\left(đktc\right)}=0,4.22,4=8,96\left(l\right)\\ b,m_{FeCl_2}=127.0,4=50,8\left(g\right)\)
Bài 1 nhé
Bài 2:
\(n_{NaOH}=\dfrac{12}{40}=0,3\left(mol\right)\\ 2NaOH+H_2SO_4\rightarrow Na_2SO_4+2H_2O\\ n_{H_2SO_4}=n_{Na_2SO_4}=\dfrac{0,3}{2}=0,15\left(mol\right);n_{H_2O}=n_{NaOH}=0,3\left(mol\right)\\ C1:m_{sp}=m_{Na_2SO_4}+m_{H_2O}=142.0,15+0,3.18=26,7\left(g\right)\\ C2:m_{H_2SO_4}=0,15.98=14,7\left(g\right)\\ \Rightarrow m_{sp}=m_{tg}=m_{NaOH}+m_{H_2SO_4}=12=14,7=26,7\left(g\right)\)
a) PTHH: Fe + 2HCl --> FeCl2 + H2
b) \(n_{Fe}=\dfrac{11,2}{56}=0,2\left(mol\right)\)
PTHH: Fe + 2HCl --> FeCl2 + H2
0,2-->0,4------>0,2-->0,2
=> \(V_{H_2}=0,2.22,4=4,48\left(l\right)\)
c) \(m_{HCl}=0,4.36,5=14,6\left(g\right)\)
d) \(m_{FeCl_2}=0,2.127=25,4\left(g\right)\)
Bài 1:
1) Fe + 2HCl --> FeCl2 + H2
2) \(n_{Fe}=\dfrac{16,8}{56}=0,3\left(mol\right)\)
PTHH: Fe + 2HCl --> FeCl2 + H2
_____0,3--------------->0,3--->0,3
=> nH2 = 0,3.22,4 = 6,72(l)
3) mFeCl2 = 0,3.127=38,1(g)
Bài 2
1) 2Al + 3H2SO4 --> Al2(SO4)3 + 3H2
2) \(n_{H_2}=\dfrac{6,72}{22,4}=0,3\left(mol\right)\)
PTHH: 2Al + 3H2SO4 --> Al2(SO4)3 + 3H2
______0,2<----------------------------------0,3
=> mAl = 0,2.27 = 5,4(g)
\(n_{Zn}=\dfrac{13}{65}=0,2(mol)\\ a,PTHH:Zn+2HCl\to ZnCl_2+H_2\\ b,n_{HCl}=2n_{Zn}=0,4(mol)\\ \Rightarrow m_{HCl}=0,4.36,5=14,6(g)\\ c,n_{H_2}=n_{Zn}=0,2(mol)\\ \Rightarrow V_{H_2}=0,2.22,4=4,48(l)\)
b) mHCl = 14,6 (g)
V H2 = 4,48 (l)
Giải thích các bước:
a) PTHH: Zn + 2HCl → ZnCl2 + H2↑
b) nZn = 13 : 65 = 0,2 mol
Theo PTHH: nHCl = 2.nZn = 0,4 mol
mHCl = 0,4 . 36,5 = 14,6(g)
c) nH2 = nZn = 0,2 mol
VH2 = 0,2 . 22,4 = 4,48 (l)
a, PT: \(2Al+6HCl\rightarrow2AlCl_3+3H_2\)
Ta có: \(n_{Al}=\dfrac{5,4}{27}=0,2\left(mol\right)\)
Theo PT: \(\left\{{}\begin{matrix}n_{AlCl_3}=n_{Al}=0,2\left(mol\right)\\n_{H_2}=\dfrac{3}{2}n_{Al}=0,3\left(mol\right)\end{matrix}\right.\)
a, Ta có: \(m_{AlCl_3}=0,2.133,5=26,7\left(g\right)\)
b, Ta có: \(V_{H_2}=0,3.22,4=6,72\left(l\right)\)
Bạn tham khảo nhé!
PTHH: \(2Al+6HCl\rightarrow2AlCl_3+3H_2\uparrow\)
Ta có: \(n_{Al}=\dfrac{5,4}{27}=0,2\left(mol\right)\)
\(\Rightarrow\left\{{}\begin{matrix}n_{AlCl_3}=0,2mol\\n_{H_2}=0,3mol\end{matrix}\right.\) \(\Rightarrow\left\{{}\begin{matrix}m_{AlCl_3}=0,2\cdot133,5=26,7\left(g\right)\\V_{H_2}=0,3\cdot22,4=6,72\left(l\right)\end{matrix}\right.\)
\(n_{Fe}=\dfrac{11.2}{56}=0.2\left(mol\right)\)
\(Fe+2HCl\rightarrow FeCl_2+H_2\)
\(0.2......0.4...........0.2.........0.2\)
\(V_{H_2}=0.2\cdot22.4=4.48\left(l\right)\)
\(m_{HCl}=0.4\cdot36.5=14.6\left(g\right)\)
\(BTKL:\)
\(m_{HCl}=m_{FeCl_2}+m_{H_2}-m_{Fe}=0.2\cdot127+0.2\cdot2-11.2=14.6\left(g\right)\)
\(a) Fe + 2HCl \to FeCl_2 + H_2\\ b) n_{H_2} = n_{Fe} = \dfrac{11,2}{56} = 0,2(mol)\\ \Rightarrow V_{H_2} = 0,2.22,4 = 4,48(lít)\\ c)C_1 : n_{HCl} = 2n_{Fe} = 0,4(mol) \Rightarrow m_{HCl} = 0,4.36,5 = 14,6(gam)\\ C_2 : \text{Bảo toàn khối lượng : }\\ m_{Fe} + m_{HCl} = m_{FeCl_2} + m_{H_2}\\ \Rightarrow m_{HCl} = 0,2.127 + 0,2.2 - 11,2 = 14,6(gam) \)