hòa tan 4,48 lít khí hidro clorua (đktc) vào 42,7 ml nc thu đc dd axit clohidric. tính nồng độ % và nồng độ mol của dd thu đc?
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a, \(Mg+2HCl\rightarrow MgCl_2+H_2\)
b, \(m_{Mg}=\dfrac{7,2}{24}=0,3\left(mol\right)\)
Theo PT: \(n_{MgCl_2}=n_{Mg}=0,3\left(mol\right)\Rightarrow m_{MgCl_2}=0,3.95=28,5\left(g\right)\)
c, \(n_{HCl}=2n_{Mg}=0,6\left(mol\right)\)
\(\Rightarrow C_{M_{HCl}}=\dfrac{0,6}{0,2}=3\left(M\right)\)
Ta có: \(n_{Mg}=\dfrac{4,8}{24}=0,2\left(mol\right)\)
PT: \(Mg+2HCl\rightarrow MgCl_2+H_2\)
a, \(n_{H_2}=n_{Mg}=0,2\left(mol\right)\)
\(\Rightarrow V_{H_2}=0,2.22,4=4,48\left(l\right)\)
b, \(n_{HCl}=2n_{H_2}=0,4\left(mol\right)\)
\(\Rightarrow C_{M_{HCl}}=\dfrac{0,4}{0,2}=2\left(M\right)\)
c, PT: \(HCl+KOH\rightarrow KCl+H_2O\)
Theo PT: \(n_{KOH}=n_{HCl}=0,4\left(mol\right)\)
\(\Rightarrow m_{ddKOH}=\dfrac{0,4.56}{5,6\%}=400\left(g\right)\)
\(\Rightarrow V_{ddKOH}=\dfrac{400}{1,045}\approx382,78\left(ml\right)\)
\(n_{Zn}=\dfrac{4,55}{65}=0,07(mol)\\ Zn+2HCl\to ZnCl_2+H_2\\ a,n_{HCl}=0,14(mol)\\ \Rightarrow C_{M_{HCl}}=\dfrac{0,14}{0,2}=0,7M\\ b,n_{H_2}=0,07(mol)\\ \Rightarrow V_{H_2}=0,07.22,4=1,568(l)\\ c,n_{ZnCl_2}=0,07(mol)\\ \Rightarrow m_{ZnCl_2}=0,07.136=9,52(g)\\ c,ZnCl_2+2AgNO_3\to 2AgCl\downarrow+Zn(NO_3)_2\)
\(m_{dd_{ZnCl_2}}=200.0,8+4,55-0,07.2=164,41(g)\\ n_{AgCl}=0,14(mol);n_{Zn(NO_3)_2}=0,07(mol)\\ \Rightarrow C\%_{Zn(NO_3)_2}=\dfrac{0,07.189}{164,41+200-0,14.143,5}.100\%=3,84%\)
nHCl = 0.3*0.75 = 0.225 (mol)
Zn + 2HCl => ZnCl2 + H2
0.1125..0.225....0.1125..0.1125
mZn = 0.1125*65 = 7.3125 (g)
VH2 = 0.1125*22.4 = 2.52 (l)
CM ZnCl2 = 0.1125/0.3 = 0.375 (M)
nHCl= 0,75 x 0,3= 0,225(mol)
PTHH: Zn + 2HCl -> ZnCl2 + H2
a) 0,1125____0,225___0,1125___0,1125(mol)
=> a=mZn=0,1125.65=7,3125(g)
V(H2,đktc)=0,1125 x 22,4=2,52(l)
b) VddZnCl2=VddHCl=0,3(l)
=>CMddZnCl2=0,1125/0,3=0,375(M)
Ta có: \(n_{H_2}=\dfrac{6,72}{22,4}=0,3\left(mol\right)\)
a. PTHH: \(Zn+H_2SO_4--->ZnSO_4+H_2\uparrow\left(1\right)\)
b. Theo PT(1): \(n_{Zn}=n_{H_2}=0,3\left(mol\right)\)
\(\Rightarrow m_{Zn}=65.0,3=19,5\left(g\right)\)
c. Theo PT(1): \(n_{H_2SO_4}=n_{Zn}=0,3\left(mol\right)\)
Đổi 300ml = 0,3 lít
\(\Rightarrow C_{M_{H_2SO_4}}=\dfrac{0,3}{0,3}=1M\)
d. PTHH: \(2NaOH+H_2SO_4--->Na_2SO_4+2H_2O\left(2\right)\)
Theo PT(2): \(n_{NaOH}=2.n_{H_2SO_4}=2.0,3=0,6\left(mol\right)\)
\(\Rightarrow m_{NaOH}=0,6.40=24\left(g\right)\)
\(\Rightarrow m_{dd_{NaOH}}=\dfrac{24.100\%}{20\%}=120\left(g\right)\)
nHCl= 4,48/22,4= 0,2(mol)
=> mHCl= 0,2.36,5= 7,3(g)
V(H2O)= 42,7 (ml)= 0,0427(l)
=> mH2O= 42,7(g)
C%ddHCl= \(\frac{7,3}{7,3+42,7}.100=14,6\%\)
\(C_{MddHCl}=\frac{0,2}{0,0427}\approx4,684\left(M\right)\)