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nH2= 13,44 : 22,4 = 0,6 (mol)
pthh : 2Al + 3H2SO4 --> Al2(SO4)3 + 3H2
0,4 <------------------- 0,2<-----------<0,6 (mol)
mAl = 0,4 . 27 = 10,8 ( g)
mAl2(SO4)3= 0,2 . 342 = 68,4 (g)
nFe3O4 = 46,4 : 232 = 0,2 (mol)
pthh : Fe3O4 + 4H2 -t--> 3Fe + 4H2O
LTL :
0,2/1 > 0,6 /4
=> Fe3O4 du
theo pt nFe=3/4 nH2 = ,45 (mol)
=> mFe= 0,45 . 56= 25,2 (g)
\(a,n_{H_2}=\dfrac{13,44}{22,4}=0,6\left(mol\right)\\ PTHH:2Al+3H_2SO_4\rightarrow2Al_2\left(SO_4\right)_3+3H_2\uparrow\\ Theo.pt:n_{Al}=n_{Al_2\left(SO_4\right)_3}=\dfrac{2}{3}n_{H_2SO_4}=\dfrac{2}{3}.0,6=0,4\left(mol\right)\\ m_{Al}=0,4.27=10,8\left(g\right)\\ b,m_{Al_2\left(SO_4\right)_3}=0,4.342=136,8\left(g\right)\\ c,n_{Fe_3O_4}=\dfrac{46,4}{232}=0,2\left(mol\right)\\ PTHH:Fe_3O_4+4H_2\underrightarrow{t^o}3Fe+4H_2O\\ LTL:\dfrac{0,2}{1}>\dfrac{0,6}{4}\Rightarrow Fe_3O_4.du\\ n_{Fe}=\dfrac{3}{4}n_{H_2}=\dfrac{3}{4}.0,4=0,3\left(mol\right)\\ m_{Fe}=0,3.56=16,8\left(g\right)\)
PTHH: \(2Al+3H_2SO_4\rightarrow Al_2\left(SO_4\right)_3+3H_2\)
Ta có: \(n_{Al}=\dfrac{2,7}{27}=0,1\left(mol\right)\)
\(\Rightarrow\left\{{}\begin{matrix}n_{H_2SO_4}=0,15\left(mol\right)=n_{H_2}\\n_{Al_2\left(SO_4\right)_3}=0,05\left(mol\right)\end{matrix}\right.\) \(\Rightarrow\left\{{}\begin{matrix}m_{H_2SO_4}=0,15\cdot98=14,7\left(g\right)\\m_{Al_2\left(SO_4\right)_3}=0,05\cdot342=17,1\left(g\right)\\V_{H_2}=0,15\cdot22,4=3,36\left(l\right)\end{matrix}\right.\)
a) \(n_{Al}=\dfrac{2,7}{27}=0,1\left(mol\right)\)
PTHH: 2Al + 3H2SO4 --> Al2(SO4)3 + 3H2
______0,1--->0,15-------->0,05------->0,15
=> mH2SO4 = 0,15.98 = 14,7 (g)
b) VH2 = 0,15.22,4 = 3,36 (l)
c) mAl2(SO4)3 = 0,05.342 = 17,1 (g)
a, mFe2O3 = 32 . 75% = 24 (g)
nFe2O3 = 24/160 = 0,15 (mol)
mCuO = 32 - 24 = 8 (g)
nCuO = 8/80 = 0,1 (mol)
PTHH:
Fe2O3 + 3H2 -> (t°) 2Fe + 3H2O
0,15 ---> 0,45 ---> 0,3
CuO + H2 -> (t°) Cu + H2O
0,1 ---> 0,1 ---> 0,1
mFe = 0,3 . 56 = 16,8 (g)
mCu = 64 . 0,1 = 6,4 (g)
b, nH2 = 0,1 + 0,45 = 0,55 (mol)
VH2 = 0,55 . 22,4 = 12,32 (l)
c, PTHH:
2Al + 6HCl -> 2AlCl3 + 3H2
11/30 <--- 1,1 <--- 11/30 <--- 0,55
mAl = 11/30 . 27 = 9,9 (g)
mHCl = 1,1 . 36,5 = 40,15 (g)
Đổi 2,5kg = 2500g
mC = 2500 . (100% - 16%) = 2100 (g)
nC = 2100/12 = 175 (mol)
PTHH: C + O2 -> (t°) CO2
Mol: 175 ---> 175 ---> 175
VO2 = 175 . 22,4 = 3920 (l)
mCO2 = 44 . 175 = 7700 (g)
\(m_C=\dfrac{2,5.\left(100-16\right)}{100}=2,1kg\)
\(m_C=2,1kg=2100g\)
\(n_C=\dfrac{m_C}{M_C}=\dfrac{2100}{12}=175mol\)
\(C+O_2\rightarrow\left(t^o\right)CO_2\)
175 175 175 ( mol )
\(V_{O_2}=n_{O_2}.22,4=175.22,4=3920l\)
\(m_{CO_2}=n_{CO_2}.M_{CO_2}=175.44=7700g\)
a) 2Al + 3H2SO4 → Al2(SO4)3 + 3H2
b) nAl = \(\frac{40,5}{27}=1,5\left(mol\right)\)
Từ PT \(\Rightarrow n_{H_2SO_4}=2,25\left(mol\right);n_{Al_2\left(SO_4\right)_3}=0,75\left(mol\right);n_{H_2}=2,25\left(mol\right)\)
\(\Rightarrow m_{H_2SO_4}=2,25.98=220,5\left(g\right)\)
c) \(m_{Al_2\left(SO_4\right)_3}=0,75.342=256,5\left(g\right)\)
d) đktc : \(V_{H_2}=22,4.2,25=50,4\left(l\right)\)
a) 2Al + 3H2SO4 → Al2(SO4)3 + 3H2 (1)
b) nAl = 40,5 : 27 = 1,5 mol
Từ pt(1) suy ra : nH2SO4 = \(\frac{3}{2}nAl\) = \(\frac{3}{2}.1,5=2,25mol\)
Khối lượng H2SO4 là : mH2SO4 = 2,25 . 98 = 220,5 g
c) Từ pt(1) => nAl2(SO4)3 = \(\frac{1}{2}nAl=\frac{1}{2}.1,5=0,75mol\)
=> mAl2(SO4)3 = 0,75 . 342 = 256,5 g
d) Từ pt(1) => nH2 = nH2SO4 = 2,25 mol
Thể tích khí H2 là : VH2=2,25 . 22,4 = 50,4 lit
PTHH: \(2Al+3H_2SO_4\rightarrow Al_2\left(SO_4\right)_3+3H_2\uparrow\)
Ta có: \(n_{H_2SO_4}=0,2\cdot1,5=0,3\left(mol\right)\)
\(\Rightarrow\left\{{}\begin{matrix}n_{Al}=0,2\left(mol\right)\\n_{Al_2\left(SO_4\right)_3}=0,1\left(mol\right)\\n_{H_2}=0,3\left(mol\right)\end{matrix}\right.\) \(\Rightarrow\left\{{}\begin{matrix}m_{Al}=0,2\cdot27=5,4\left(g\right)\\V_{H_2}=0,3\cdot22,4=6,72\left(l\right)\\C_{M_{Al_2\left(SO_4\right)_3}}=\dfrac{0,1}{0,2}=0,5\left(M\right)\end{matrix}\right.\)
nH2SO4 = 14,7: 27=0,54(mol)
PTHH : 2Al + 3H2SO4 --> Al2(SO4)3 + 3H2
theo pt , nH2 = nH2SO4=0,54(mol)
=> VH2(đktc) = 0,54. 22,4=12,096 (l)
b theo pt nAl = 3/2. nH2=0,36 (mol)
=> mAl = 0,36.27 =9,72(g)
c)theo pt n Al2(SO4)3 = 1/2nAl = 0,18(mol)
=>mAl2(SO4)3= 0,18.342=61,56(g)