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\(n_{Mg}=\frac{m}{M}=\frac{9,6}{24}=0,4mol\)
PTHH: \(Mg+H_2SO_4\rightarrow MgSO_4+H_2\uparrow\)
1 : 1 : 1 : 1 mol
0,4 0,4 0,4 0,4 mol
a. \(m_{MgSO_4}=n.M=0,4.\left(24+32+16.4\right)=48g\)
b. \(V_{H_2}=n.22,4=0,4.22,4=8,96l\)
c. \(n_{Fe_2O_3}=\frac{m}{M}=\frac{64}{56.2}+16.3=0,4mol\)
PTHH: \(3H_2+Fe_{2O_3}\rightarrow2Fe+3H_2O\left(ĐK:t^o\right)\)
3 : 1 : 2 : 3 mol
1, 7 0,4 0,8 1,2 mol
\(m_{Fe}=n.M=0,8.56=44,8g\)
a ) \(n_{Fe_2O_3}=\frac{32}{160}=0,2\) mol
\(Fe_2O_3+3H_2\underrightarrow{t^0}2Fe+3H_2O\)
0,2 ->0,6 ->0,4
\(\Rightarrow m_{Fe}=56.0,4=22,4\) gam
b ) \(n_{H_2}=3n_{Fe}=0,6\) mol \(\Rightarrow V_{H_2}=0,6.22,4=13,44\) lít .
a) \(n_{Fe_2O_3}=\frac{32}{160}=0,2\left(mol\right)\)
PTHH : \(Fe_2O_3+3H_2-t^o->2Fe+3H_2O\)
Theo pthh : \(n_{H_2}=3n_{Fe_2O_3}=0,6\left(mol\right)\)
=> \(V_{H_2}=0,6\cdot22,4=13,44\left(l\right)\)
b) Theo pthh : \(n_{H_2O}=n_{H_2}=0,6\left(mol\right)\)
=> \(m_{H_2O}=0,6\cdot18=10,8\left(g\right)\)
c) Theo pthh : \(n_{Fe}=2n_{Fe_2O_3}=0,4\left(mol\right)\)
=> \(m_{Fe}=0,4\cdot56=22,4\left(g\right)\)
PT: \(Fe+H_2SO_4\rightarrow FeSO_4+H_2\)
Ta có: \(n_{Fe}=\dfrac{2,8}{56}=0,05\left(mol\right)\)
a, Theo PT: \(n_{FeSO_4}=n_{Fe}=0,05\left(mol\right)\Rightarrow m_{FeSO_4}=0,05.152=7,6\left(g\right)\)
b, Theo PT: \(n_{H_2}=n_{Fe}=0,05\left(mol\right)\Rightarrow V_{H_2}=0,05.22,4=1,12\left(l\right)\)
c, PT: \(CuO+H_2\underrightarrow{t^o}Cu+H_2O\)
Theo PT: \(n_{Cu\left(LT\right)}=n_{H_2}=0,05\left(mol\right)\)
\(\Rightarrow m_{Cu\left(TT\right)}=0,05.64=3,2\left(g\right)\)
Mà: mCu (TT) = 3,04 (g)
\(\Rightarrow H\%=\dfrac{3,04}{3,2}.100\%=95\%\)
PT: ��+�2��4→����4+�2Fe+H2SO4→FeSO4+H2
Ta có: ���=2,856=0,05(���)nFe=562,8=0,05(mol)
a, Theo PT: �����4=���=0,05(���)⇒�����4=0,05.152=7,6(�)nFeSO4=nFe=0,05(mol)⇒mFeSO4=0,05.152=7,6(g)
b, Theo PT: ��2=���=0,05(���)⇒��2=0,05.22,4=1,12(�)nH2=nFe=0,05(mol)⇒VH2=0,05.22,4=1,12(l)
c, PT: ���+�2��→��+�2�CuO+H2toCu+H2O
Theo PT: ���(��)=��2=0,05(���)nCu(LT)=nH2=0,05(mol)
⇒���(��)=0,05.64=3,2(�)⇒mCu(TT)=0,05.64=3,2(g)
Mà: mCu (TT) = 3,04 (g)
⇒�%=3,043,2.100%=95%⇒H%=3,23,04.100%=95%
I) nFe=11,2:56=0,2(mol)
PTHH: Fe2O3 + 3H2 -> 2Fe + 3H2O
Theo phương trình ta có: nH2= 3/2nFe=3/2.0,2=0,3(mol)
-> VH2=0,3.22,4=6,72(mol)
b) PTHH: 2H2O --điện phân--> 2H2 + O2
Theo phương trình ta có: nH2O=nH2=0,3(mol)
-> mH2O=0,3.18=5,4(g)
a) Fe2O3+3H2--->2Fe+3H2O
n Fe=79/56=1,4(mol)
Theo pthh
n Fe2O3=1/2n Fe=0,7(mol)
m Fe2O3=0,7.160=112(g)
b) n H2O=3/2n Fe=0,933(mol)
m H2O=0,933.18=16,794(g)
c) n H2=3/2n Fe=0,933(mol)
V H2=0,933.22,4=20,8992(l)
a)
\(n_{Fe}=\frac{79}{56}\left(mol\right)\)
\(Fe_2O_3+3H_2\rightarrow2Fe+3H_2O\)
79/112_237/112 __79/56__237/112
\(m_{Fe2O3}=\frac{160.79}{112}=112,86\left(g\right)\)
b)
\(m_{H2O}=\frac{237}{112.18}=38,09\left(g\right)\)
c)
\(\rightarrow V_{H2}=\frac{237}{112}.22,4=47,4\left(l\right)\)