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a+b+c) PTHH: \(Zn+2HCl\rightarrow ZnCl_2+H_2\uparrow\)
Ta có: \(n_{Zn}=\dfrac{6,5}{65}=0,1\left(mol\right)=n_{ZnCl_2}=n_{H_2}\)
\(\Rightarrow\left\{{}\begin{matrix}m_{ZnCl_2}=0,1\cdot136=13,6\left(g\right)\\V_{H_2}=0,1\cdot22,4=2,24\left(l\right)\end{matrix}\right.\)
d) PTHH: \(CuO+H_2\underrightarrow{t^o}Cu+H_2O\)
Theo PTHH: \(n_{H_2}=n_{Cu}=0,1\left(mol\right)\)
\(\Rightarrow m_{Cu}=0,1\cdot64=6,4\left(g\right)\)
\(n_{Zn}=\dfrac{6,5}{65}=0,1\left(mol\right)\\
pthh:Zn+2HCl\rightarrow ZnCl_2+H_2\)
0,1 0,2 0,1
\(V_{H_2}=0,1.22,4=2,24l\\
m_{HCl}=\left(0,2.36,5\right).10\%=0,73g\)
\(n_{Fe_2O_3}=\dfrac{16}{160}=0,1\left(mol\right)\\
pthh:Fe_2O_3+3H_2\underrightarrow{t^o}2Fe+3H_2O\\
LTL:\dfrac{0,1}{1}>\dfrac{0,1}{3}\)
=> Fe2O3 dư
\(n_{Fe}=\dfrac{2}{3}n_{H_2}=0,067\left(mol\right)\\
m_{Fe}=0,067.56=3,73g\)
a.b.\(n_{Zn}=\dfrac{6,5}{65}=0,1mol\)
\(Zn+2HCl\rightarrow ZnCl_2+H_2\)
0,1 0,2 0,1 ( mol )
\(V_{H_2}=0,1.22,4=2,24l\)
\(m_{ddHCl}=\dfrac{0,2.36,5}{10\%}=73g\)
c.\(n_{Fe_2O_3}=\dfrac{16}{160}=0,1mol\)
\(Fe_2O_3+3H_2\rightarrow\left(t^o\right)2Fe+3H_2O\)
0,1 > 0,1 ( mol )
0,1 1/15 ( mol )
\(m_{Fe}=\dfrac{1}{15}.56=3,73g\)
nZn = 13 / 65 = 0,2 (mol)
Zn + 2HCl --- > ZnCl2 + H2
0,2 0,4 0,2 0,2
mZnCl2 = 0,2 . 136 = 27,2 (g)
VH2 = 0,2 . 22,4 = 4,48(l)
\(n_{Zn}=\dfrac{m}{M}=\dfrac{13}{65}=0,2mol\)
\(PTHH:Zn+2HCl\rightarrow ZnCl+H_2\uparrow\)
\(1\) : \(2\) : \(1\) : \(1\) \(\left(mol\right)\)
\(0,2\) \(0,4\) \(0,2\) \(0,2\) \(\left(mol\right)\)
\(b,m_{ZnCl_2}=n.M=0,2.136=27,2\left(g\right)\)
\(c,V_{H_2}=n.22,4=0,2.22,4=4,48\left(l\right)\)
`Zn + 2HCl -> ZnCl_2 + H_2`
`0,1` `0,2` `0,1` `(mol)`
`n_[Zn]=[6,5]/65=0,1(mol)`
`a)V_[H_2]=0,1.22,4=2,24(l)`
`b)C%_[HCl]=[0,2.36,5]/200 . 100 =3,65%`
`Zn + HCl -> ZnCl_2 + H_2` `\uparrow`
`n_(Zn) = (6,5)/65 = 0,1 mol`.
`n_(H_2) = 0,1 mol`.
`V(H_2) = 0,1 xx 22,4 = 2,24l`.
`C%(HCl) = (0,2.36,5)/200 xx 100 = 36,5%`.
a) Zn + 2HCl →ZnCl2 + H2
b) nZn = 6,5/65 = 0,1 mol . Theo tỉ lệ pư => nH2 = nZn = nZnCl2 =0,1 mol <=> VH2(đktc) = 0,1.22,4 = 2,24 lít.
c) mZnCl2 = 0,1 . 136 = 13,6 gam
d) nHCl =2nZn = 0,2 mol => mHCl = 0,2.36,5= 7,3 gam
Cách 2: áp dụng định luật BTKL => mHCl = mZnCl2 + mH2 - mZn
<=> mHCl = 13,6 + 0,1.2 - 6,5 = 7,3 gam
\(a,PTHH:Zn+2HCl\rightarrow ZnCl_2+H_2\)
\(b,n_{Zn}=\dfrac{m}{M}=\dfrac{16,25}{65}=0,25\left(mol\right)\\ Theo.PTHH:n_{HCl}=2.n_{Zn}=2.0,25=0,5\left(mol\right)\\ m_{HCl}=n.M=0,5.36,5=18,25\left(g\right)\)
\(Theo.PTHH:n_{H_2}=n_{Zn}=0,25\left(mol\right)\\ V_{H_2\left(đktc\right)}=n.22,4=0,25.22,4=5,6\left(l\right)\)
a)PTHH: \(Zn+2HCl\rightarrow ZnCl_2+H_2\)
b)Khối lượng Zn:\(m_{Zn}=\dfrac{16,25}{65}=0,25\left(mol\right)\)
Ta có: \(n_{HCl}=2n_{Zn}=0,5\left(mol\right)\)
Khối lượng axit HCl cần dùng là: \(m_{HCl}=0,5.36,5=18,25\left(g\right)\)
c)Theo pt ta có: \(n_{H_2}=n_{Zn}=0,25\left(mol\right)\)
Thể tích H2 là: \(V_{H_2}=n.22,4=0,25.22,4=5,6\left(ml\right)\)
Bài 1:
\(n_{Zn}=\dfrac{6,5}{65}=0,1\left(mol\right)\\ PTHH:Zn+2HCl\rightarrow ZnCl_2+H_2\\ \left(mol\right)....0,1\rightarrow0,2.........0,1.......0,1\\ a,m_{HCl}=0,1.36,5=3,65\left(g\right)\\ b,m_{ZnCl_2}=0,1.136=13,6\left(g\right)\\c,V_{H_2} =0,1.22,4=2,24\left(l\right)\)
Bài 2:
\(n_P=\dfrac{3,1}{31}=0,1\left(mol\right)\\ PTHH:4P+5O_2\underrightarrow{t^o}2P_2O_5\\ \left(mol\right)...0,1\rightarrow0,125...0,05\\ a,m_{P_2O_5}=0,05.142=7,1\left(g\right)\\ a,V_{O_2}=0,125.22,4=2,8\left(l\right)\)
a)
\(Zn + 2HCl \to ZnCl_2 + H_2\\ n_{ZnCl_2} = n_{H_2} = n_{Zn} = \dfrac{19,5}{65} =0,3(mol)\\ V_{H_2} = 0,3.22,4 = 6,72(lít)\\ b) m_{ZnCl_2} = 0,3.136 = 40,8(gam)\\ c) n_{HCl} = 2n_{Zn} = 0,6(mol) \Rightarrow V_{dd\ HCl} = \dfrac{0,6}{2} = 0,3(lít)\\ d) 2H_2 + O_2 \xrightarrow{t^o} 2H_2O\\ V_{O_2} = \dfrac{1}{2} V_{H_2} = 3,36(lít)\\ V_{không\ khí} = \dfrac{V_{O_2}}{20\%}= \dfrac{3,36}{20\%} = 16,8(lít)\)
Theo gt ta có: $n_{Zn}=0,1(mol)$
a, $Zn+2HCl\rightarrow ZnCl_2+H_2$
b, Ta có: $n_{H_2}=0,1(mol)\Rightarrow V_{H_2}=2.24(l)$
c, Ta có: $n_{HCl}=2.n_{Zn}=0,2(mol)\Rightarrow m_{HCl}=7,3(g)$
\(n_{Zn}=\dfrac{m}{M}=\dfrac{19,5}{65}=0,3\left(mol\right)\)
\(PTHH:Zn+2HCl\rightarrow ZnCl_2+H_2\uparrow\)
\(0,3:0,6:0,3:0,3\left(mol\right)\)
\(V_{H_2}=n.22,4=0,3.22,4=6.72\left(l\right)\)
\(m_{ZnCl_2}=n.M=0,3.\left(65+71\right)=0,3.136=40,8\left(g\right)\)
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