Hãy nhập câu hỏi của bạn vào đây, nếu là tài khoản VIP, bạn sẽ được ưu tiên trả lời.
\(m_{HCl}=50.7,3\%=3,65\left(g\right)\\ n_{HCl}=\dfrac{3,65}{36,5}=0,1\left(mol\right)\\ PTHH:Zn+2HCl\rightarrow ZnCl_2+H_2\\ n_{Zn}=n_{H_2}=n_{ZnCl_2}=\dfrac{1}{2}n_{HCl}=\dfrac{1}{2}.0,1=0,05\left(mol\right)\\ m_{Zn}=0,05.65=3,25\left(g\right)\\ V_{H_2\left(ĐKTC\right)}=0,05.22,4=1,12\left(l\right)\\ m_{ZnCl_2}=0,05.136=6,8\left(g\right)\)
mHCl=50.7,3%=3,65(g) -> nHCl=0,1(mol)
a) PTHH: Zn + 2 HCl -> ZnCl2 + H2
nH2=nZnCl2=nZn=nHCl/2= 0,1/2=0,05(mol)
b) m=mZn=0,05.65=3,25(g)
c) V(H2,đktc)=0,05.22,4=1,12(l)
d) mZnCl2= 136.0,05= 7,8(g)
\(n_{Zn}=\dfrac{13}{65}=0,2mol\)
\(Zn+2HCl\rightarrow ZnCl_2+H_2\)
0,2 0,4 0,2 0,2
\(m_{HCl}=0,4\cdot36,5=14,6g\)
\(a=m_{ddHCl}=\dfrac{14,6}{14,6\%}\cdot100\%=100g\)
\(V_{H_2}=0,2\cdot22,4=4,48l\)
\(m_{ZnCl_2}=0,2\cdot136=27,2g\)
\(n_{HCl}=\dfrac{100.7,3\%}{36,5}=0,2\left(mol\right)\\ a,PTHH:Zn+2HCl\rightarrow ZnCl_2+H_2\\ b,n_{Zn}=n_{H_2}=n_{ZnCl_2}=\dfrac{0,2}{2}=0,1\left(mol\right)\\ m=m_{Zn}=0,1.65=6,5\left(g\right)\\ c,V_{H_2\left(đktc\right)}=0,1.22,4=2,24\left(l\right)\\ d,m_{ddZnCl_2}=6,5+100-0,1.2=106,3\left(g\right)\\ C\%_{ddZnCl_2}=\dfrac{0,1.136}{106,3}.100\approx12,794\%\)
\(a,n_{Zn}=\dfrac{0,65}{65}=0,01\left(mol\right)\)
PTHH: \(Zn+2HCl\rightarrow ZnCl_2+H_2\)
0,01--->0,02---->0,01---->0,01
\(V_{H_2}=0,01.22,4=0,224\left(l\right)\\ b,m_{ZnCl_2}=0,01.136=1,36\left(g\right)\\ V_{ddHCl}=\dfrac{0,02}{2}=0,01\left(l\right)\)
a. \(n_{Zn}=\dfrac{6.5}{65}=0,1\left(mol\right)\)
PTHH : Zn + 2HCl -> ZnCl2 + H2
0,1 0,2 0,1
b. \(V_{H_2}=0,1.22,4=2,24\left(l\right)\)
c. \(m_{HCl}=0,2.36,5=7,3\left(g\right)\)
\(n_{Zn}=\dfrac{6,5}{65}=0,1mol\)
\(Zn+2HCl\rightarrow ZnCl_2+H_2\)
0,1 0,2 0,1
\(V_{H_2}=0,1\cdot22,4=2,24l\)
\(m_{HCl}=0,2\cdot36,5=7,3g\)
\(a) Zn + 2HCl \to ZnCl_2 + H_2\\ b) n_{H_2} = n_{Zn} = \dfrac{6,5}{65} = 0,1(mol)\\ V_{H_2} = 0,1.22,4 = 2,24(lít)\\ c) n_{HCl} = 2n_{Zn} = 0,2(mol)\\ \Rightarrow m_{dd\ HCl} = \dfrac{0,2.36,5}{3,75\%} = 194,67(gam)\\ d) n_{ZnCl_2} = n_{Zn} = 0,1(mol)\\ m_{ZnCl_2} = 0,1.136 = 13,6(gam)\)
Câu 1:
a, \(Zn+2HCl\rightarrow ZnCl_2+H_2\)
b, \(n_{Zn}=\dfrac{16,25}{65}=0,25\left(mol\right)\)
\(n_{H_2}=n_{Zn}=0,25\left(mol\right)\)
\(\Rightarrow V_{H_2}=0,25.24,79=6,1975\left(l\right)\)
c, \(n_{HCl}=2n_{Zn}=0,5\left(mol\right)\)
\(\Rightarrow m_{HCl}=0,5.36,5=18,25\left(g\right)\)
\(\Rightarrow m_{ddHCl}=\dfrac{18,25}{10\%}=182,5\left(g\right)\)
d, \(n_{ZnCl_2}=n_{Zn}=0,25\left(mol\right)\)
\(\Rightarrow C\%_{ZnCl_2}=\dfrac{0,25.136}{16,25+182,5-0,25.2}.100\%\approx17,15\%\)
Câu 2:
a, \(2NaOH+H_2SO_4\rightarrow Na_2SO_4+2H_2O\)
c, \(n_{NaOH}=\dfrac{40}{40}=1\left(mol\right)\)
Theo PT: \(n_{H_2SO_4}=\dfrac{1}{2}n_{NaOH}=0,5\left(mol\right)\)
\(\Rightarrow V_{H_2SO_4}=\dfrac{0,5}{2}=0,25\left(l\right)\)
d, \(n_{Na_2SO_4}=\dfrac{1}{2}n_{NaOH}=0,5\left(mol\right)\)
\(\Rightarrow C_{M_{Na_2SO_4}}=\dfrac{0,5}{0,25}=2\left(M\right)\)
1)nCuO=4:80=0,05(mol)
nHCl=2,92:36,5=0,08(mol)
a)+b)
CuO+2HCl->CuCl2+H2O
0,04.....0,08.....0,04............(mol)
Ta có:\(\dfrac{n_{CuO}}{1}>\dfrac{n_{HCl}}{2}\)=>CuO dư,HCl hết.Tính theo HCl.
Theo PTHH:
Sau pư,chất còn lại gồm:CuO dư,CuCl2
Theo PTHH:mCuO(dư)=(0,05-0,04).80=0,8(g)
\(m_{CuCl_2}\)=0,04.135=5,4(g)
2)a+b+c+d)
mHCl=7,3%.50=3,65(g)
=>nHCl=3,65:36,5=0,1(mol)
Zn+2HCl->ZnCl2+H2
0,05...0,1....0,05....0,05.......(mol)
Theo PTHH:m=mZn=0,05.65=3,25(g)
\(V_{H_2\left(đktc\right)}\)=0,05.22,4=1,12(l)
\(m_{ZnCl_2}\)=0,05.136=6,8(g)