a, PTHH: Fe + 2HCl -> FeCl2 + H2
Ta có: \(n_{Fe}=\dfrac{5,6}{56}=0,1\left(mol\right)\)
b, Ta có: \(n_{H_2}=n_{FeCl_2}=n_{Fe}=0,1\left(mol\right)\\ n_{HCl}=2.0,1=0,2\left(mol\right)\\ =>m_{HCl}=0,2.36,5=7,3\left(g\right)\)
=> \(m_{FeCl_2}=0,1.127=12,7\left(g\right)\\ V_{H_2\left(đktc\right)}=0,1.22,4=2,24\left(l\right)\)
c, Nồng độ phần trăm của ddHCl tham gia phản ứng:
\(C\%_{ddHCl}=\dfrac{7,3}{146}.100=5\%\)
PTHH: Fe + 2HCl -> FeCl2 + H2
Ta có: \(n_{Fe}=\dfrac{5,6}{56}=0,1\left(mol\right)\\ =>n_{FeCl_2}=n_{H_2}=n_{Fe}=0,1\left(mol\right)\\ =>m_{FeCl_2}=0,1.127=12,7\left(g\right)\\ V_{H_2\left(đktc\right)}=0,1.22,4=2,24\left(l\right)\\ n_{HCl}=2.0,1=0,2\left(mol\right)\\ =>m_{HCl}=0,2.36,5=7,3\left(g\right)\)
=> \(C\%_{ddHCl}=\dfrac{7,3}{146}.100=5\%\)
a) PTHH: Fe + 2HCl -> FeCl2 + H2
b) Ta có: nFe = \(\dfrac{5,6}{56}\) = 0,1 mol
cứ 1 mol Fe -> 2 mol HCl -> 1 mol FeCl2 -> 1 mol H2
0,1 mol -> 0,2 mol -> 0,1 mol -> 0,1 mol
=> \(m_{FeCl_2}\) = 0,1 x 127 = 12,7 (g)
\(V_{H_2}\) = 0,1 x 22,4 = 2,24 l
c) Ta có: mHCl (ct) = 0,2 x 36,5 = 7,3 (g)
=> C% = \(\dfrac{m_{ct}}{m_{dd}}\) x 100% = \(\dfrac{7,3}{146}\times100\%\) = 5%
nFe=m/M=5,6/56=0,1 (mol)
PT:
Fe + 2HCl -> FeCl2 +H2\(\uparrow\)
1........2..............1...........1 (mol)
0,1 -> 0,2 -> 0,1 -> 0,1 (mol)
b) Muối thu được là FeCl2
=> mFeCl2=n.M=0,1.127=12,7(gam)
VH2=n.22,4=0,1.22,4=2,24(lít)
c) mHCl=n.M=0,2.36,5=7,3 (g)
=> \(C\%_{ddHCl}=\dfrac{m_{HCl}.100\%}{m_{ddHCl}}=\dfrac{7,3.100}{146}=5\left(\%\right)\)