Cho 13 gam Zn tác dụng với HCl 7,5% a. Tính khối lượng dd HCl. b. Tính C% dd sau phản ứng.
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\(n_{Zn}=\dfrac{6,5}{65}=0,1\left(mol\right)\\
pthh:Zn+2HCl\rightarrow ZnCl_2+H_2\)
0,1 0,2 0,1 0,1
\(m_{HCl}=0,2.36,5=7,3\left(g\right)\\
V_{H_2}=0,1.22,4=2,24l\\
m_{\text{dd}}=6,5+200-\left(0,1.2\right)=206,3g\)
bài 2 :
\(n_{Mg}=\dfrac{4,8}{24}=0,2\left(mol\right)\\
pthh:Mg+2HCl\rightarrow MgCl_2+H_2\)
0,2 0,4 0,2 0,2
\(m_{HCl}=0,4.36,5=14,6g\\
V_{H_2}=0,2.22,4=4,48l\\
m\text{dd}=4,8+200-0,4=204,4g\\
C\%=\dfrac{0,2.136}{204,4}.100\%=13,3\%\)
a) \(n_{HCl}=\dfrac{m}{M}=\dfrac{13}{65}=0,2\left(mol\right)\)
\(Zn+2HCl\rightarrow ZnCl_2+H_2\uparrow\)
1 2 1 1 (mol)
0,2 0,4 0,2 0,2 (mol)
b) Thể tích khí hidro:
V = n.22,4 = 0,2.22,4 = 4,48 (l)
c) Khối lượng muối tạo thành:
\(m_{ZnCl_2}=n.M=0,2.\left(65+35,5.2\right)=27,2\left(g\right)\)
d) \(m_{ctHCl}=n.M=0,4.\left(1+35,5\right)=14,6\left(g\right)\)
\(C\%_{HCl}=\dfrac{m_{ctHCl}}{m_{ddHCl}}.100\%=\dfrac{14,6}{200}.100\%=7,3\%\)
\(a.HCl+NaOH\rightarrow NaCl+H_2O\)
PỨ trung hoà
\(b,n_{NaOH}=0,1.1=0,1mol\\ n_{NaCl}=n_{NaOH}=n_{HCl}0,1mol\\ m=m_{HCl}=0,1.36,5=3,65g\\ c,m_{NaCl}=0,1.58,5=5,85g\\ d,n_{HCl}=\dfrac{73.10}{100.36,5}=0,2mol\\ \Rightarrow\dfrac{0,1}{1}< \dfrac{0,2}{1}\Rightarrow HCl.dư\\ n_{HCl,pứ}=n_{NaOH}=0,1mol\\ m_{HCl,dư}=\left(0,2-0,1\right).36,5=3,65g\)
\(a) Zn + 2HCl \to ZnCl_2 + H_2\\ n_{ZnCl_2} = n_{Zn} = \dfrac{6,5}{65} = 0,1(mol)\\ m_{ZnCl_2} = 0,1.136 = 13,6(gam)\\ b) n_{H_2} = n_{Zn} = 0,1(mol) \Rightarrow V_{H_2} = 0,1.22,4 =2 ,24(lít)\\ c) n_{HCl} =2 n_{H_2} = 0,2(mol)\\ \Rightarrow m_{HCl} = 0,2.36,5 = 7,3(gam)\ ; V_{dd\ HCl} = \dfrac{0,2}{0,5} = 0,4(lít)\)
\(n_{Zn}=\dfrac{13}{65}=0,2mol\)
\(Zn+2HCl\rightarrow ZnCl_2+H_2\)
0,2 0,4 0,2 0,2
\(V_{H_2}=0,2\cdot22,4=4,48l\)
\(m_{HCl}=0,4\cdot36,5=14,6g\)
c)Cho dẫn qua copper (ll) oxit:
\(CuO+H_2\rightarrow Cu+H_2O\)
0,2 0,2 0,2 0,2
\(m_{Cu}=0,2\cdot64=12,8g\)
\(a.n_{Zn}=\dfrac{6,5}{65}=0,1\left(mol\right)\\ n_{HCl}=\dfrac{17,8\%.200}{36,5}=\dfrac{356}{365}\left(mol\right)\\ Zn+2HCl\rightarrow ZnCl_2+H_2\\ Vì:\dfrac{0,1}{1}< \dfrac{\dfrac{356}{365}}{2}\\ \Rightarrow Znhết,HCldư\\ n_{HCl\left(dùng\right)}=0,1.2=0,2\left(mol\right)\\ m_{HCl\left(dùng\right)}=0,2.36,5=7,3\left(g\right)\\ b.n_{H_2}=n_{ZnCl_2}=n_{Zn}=0,1\left(mol\right)\\ V_{H_2\left(đktc\right)}=0,1.22,4=2,24\left(l\right)\\ c.n_{HCl\left(Dư\right)}=\dfrac{356}{365}-0,2=\dfrac{283}{365}\left(mol\right)\\ C\%_{ddZnCl_2}=\dfrac{0,1.136}{6,5+200}.100\approx6,586\%\)
\(C\%_{ddHCl\left(dư\right)}=\dfrac{\dfrac{283}{365}.36,5}{6,5+200}.100\approx13,705\%\)
\(n_{Zn}=\dfrac{19,5}{65}=0,3\left(mol\right);n_{HCl}=0,5.1=0,5\left(mol\right)\\ PTHH:Zn+2HCl\rightarrow ZnCl_2+H_2\\ Vì:\dfrac{0,3}{1}>\dfrac{0,5}{2}\Rightarrow HCl.hết,Zn.dư\\ Chất.sau.phản.ứng:ZnCl_2,H_2,Zn\left(dư\right)\\ n_{ZnCl_2}=n_{H_2}=n_{Zn\left(p.ứ\right)}=\dfrac{0,5}{2}=0,25\left(mol\right)\\ n_{Zn\left(dư\right)}=0,3-0,25=0,05\left(mol\right)\\ m_{ZnCl_2}=136.0,25=34\left(g\right)\\ m_{H_2}=0,25.2=0,5\left(g\right)\\ m_{Zn\left(dư\right)}=0,05.65=3,25\left(g\right)\)
\(NaOH+HCl\rightarrow NaCl+H_2O\)
a, \(n_{NaCl}=n_{HCl}=0,5\left(mol\right)\)
\(\Rightarrow m_{NaCl}=0,5.58,5=29,25\left(g\right)\)
b, Bạn xem lại xem đề hỏi gì nhé.
a, PT: \(Mg+2HCl\rightarrow MgCl_2+H_2\)
\(MgCl_2+2NaOH\rightarrow2NaCl+Mg\left(OH\right)_{2\downarrow}\)
\(Mg\left(OH\right)_2\underrightarrow{t^o}MgO+H_2O\)
b, Ta có: \(n_{Mg}=\dfrac{9,6}{24}=0,4\left(mol\right)\)
Theo PT: \(n_{HCl}=2n_{Mg}=0,8\left(mol\right)\)
\(\Rightarrow C_{M_{HCl}}=\dfrac{0,8}{0,2}=4\left(M\right)\)
c, Theo PT: \(n_{MgO}=n_{Mg}=0,4\left(mol\right)\)
\(\Rightarrow m_{MgO}=0,4.40=16\left(g\right)\)
Sửa đề : 7.3%
\(n_{Zn}=\dfrac{13}{65}=0.2\left(mol\right)\)
\(Zn+2HCl\rightarrow ZnCl_2+H_2\)
\(0.2........0.4..........0.2.........0.2\)
\(m_{HCl}=0.4\cdot36.5=14.6\left(g\right)\)
\(m_{dd_{HCl}}=\dfrac{14.6\cdot100}{7.3}=200\left(g\right)\)
\(m_{ZnCl_2}=0.2\cdot136=27.2\left(g\right)\)
\(m_{\text{dung dịch sau phản ứng}}=13+200-0.2\cdot2=212.6\left(g\right)\)
\(C\%_{ZnCl_2}=\dfrac{27.2}{212.6}\cdot100\%=12.79\%\)
nZn = 0,2 mol
a, PTHH : Zn + 2HCl -> ZnCl2 + H2
- Theo PTHH : nHCl = 2nZn = 0,4mol
=> mHCl = 14,6g
=> mddHCl = \(\dfrac{584}{3}\)g
b, - Theo PTHH : nZnCl2 = nZn = 0,2 mol
=> mZnCl2 = 27,2g
Mà mdd = mZn + mdd - mH2 = \(\dfrac{3109}{15}\)g
=> C%ZnCl2 = ~13,12%