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nFe = 16.8/56 = 0.3 (mol)
3Fe + 2O2 -to-> Fe3O4
0.3......0.2...........0.1
VO2 = 0.2*22.4 = 4.48 (l)
mFe3O4 = 0.1*232 = 23.2 (g)
a. Công thức về khối lượng:
\(m_{Fe_2O_3}+m_{H_2}=m_{Fe}+m_{H_2O}\)
b. Áp dụng câu a, ta có:
\(m_{Fe_2O_3}+2=56+18\)
\(\Leftrightarrow m_{Fe_2O_3}=56+18-2\)
\(\Leftrightarrow m_{Fe_2O_3}=72\left(g\right)\)
\(a)3H_2+Fe_2O_3-^{t^o}\rightarrow2Fe+3H_2O\\b)BTKL:m_{H_2}+m_{Fe_2O_3}=m_{Fe}+m_{H_2O}\\ \Leftrightarrow2+m_{Fe_2O_3}=56+18 \\ \Rightarrow m_{Fe_2O_3}=72\left(g\right)\)
\(n_{Cu}=\dfrac{12.8}{64}=0.2\left(mol\right)\)
\(CuO+H_2\underrightarrow{^{t^0}}Cu+H_2O\)
\(0.2......0.2.....0.2\)
\(V_{H_2}=0.2\cdot22.4=4.48\left(l\right)\)
\(m_{CuO}=0.2\cdot80=16\left(g\right)\)
Theo ĐLBTKL: mCuO + mH2 = mrắn sau pư + mH2O
Mà \(\left\{{}\begin{matrix}m_{H_2}=2a\left(g\right)\\m_{H_2O}=18a\left(g\right)\end{matrix}\right.\)
=> 32 + 2a = 28,8 + 18a ý bn :)
?????
MH2 = 2 (g/mol), nH2 = a (mol) thì mH2 = 2a (g) còn gì
tương tự với H2O
a, 2Mg + O2 \(\underrightarrow{t^o}\) 2MgO
b, \(n_{Mg}=\dfrac{4,8}{24}=0,2mol\)
\(n_{O_2}=\dfrac{0,2}{2}=0,1mol\)
\(m_{O_2}=0,1.32=3,2g\)
\(V_{O_2}=0,1.22,4=2,24l\)
c, Cách 1:
\(Theo.ĐLBTKL,ta.có:\\ m_{Mg}+m_{O_2}=m_{MgO}\)
\(\Rightarrow m_{MgO}=4,8+3,2=8g\)
Cách 2:
\(n_{MgO}=\dfrac{0,2.2}{2}=0,2mol\)
\(\Rightarrow m_{MgO}=0,2.40=8g\)
2K+2H2O->2KOH+H2
0,3------------------------0,15
H2+Ag2O-to>2Ag+H2O
0,15----0,15---------0,3
n K=0.3 mol
VH2=0,15.22,4=3,36l
n Ag2O=0,2 mol
=>Ag2Odư
=>m cr=0,3.108+0,05.232=44g
\(a,n_K=\dfrac{11,7}{39}=0,3\left(mol\right)\)
PTHH: \(K+H_2O\rightarrow KOH+\dfrac{1}{2}H_2\)
0,3---------------------->0,15
\(b,\rightarrow V_{H_2}=0,15.22,4=3,36\left(l\right)\)
\(c,n_{Ag_2O}=\dfrac{46,4}{232}=0,2\left(mol\right)\\ \rightarrow n_O=0,2\left(mol\right)\)
PTHH: \(O+H_2\rightarrow H_2O\)
bđ 0,2 0,15
pư 0,15 0,15
spư 0,05 0
\(\rightarrow m_{CR}=46,4-0,15.16=44\left(g\right)\)
\(a,n_{Fe_2O_3}=\dfrac{8}{160}=0,05\left(mol\right)\\ PTHH:Fe_2O_3+3H_2\underrightarrow{t^o}2Fe+3H_2O\\ Mol:0,05\rightarrow0,15\rightarrow0,1\\ m_{Fe}=0,1.56=5,6\left(g\right)\\ b,V_{H_2}=0,15.22,4=3,36\left(l\right)\\ c,n_{O_2}=\dfrac{1,12}{22,4}=0,05\left(mol\right)\\ \\ PTHH:3Fe+2O_2\underrightarrow{t^o}Fe_3O_4\\ LTL:\dfrac{0,1}{3}>\dfrac{0,05}{2}\Rightarrow Fe.dư\\ n_{Fe_3O_4}=\dfrac{0,05}{2}=0,025\left(mol\right)\\ m_{Fe_3O_4}=0,025.232=5,8\left(g\right)\)
nFe2O3 = 8 : 160 = 0,05 (mol)
pthh: Fe2O3 + 3H2 -t--> 2Fe + 3H2O
0,05--------0,15----->0,1 (mol)
=> VH2= 0,15 . 22,4 = 3,36 (L)
=> mFe = 0,1 . 56 = 5,6 (g)
nO2 = 1,12 : 22,4 = 0,05 (mol)
pthh : 2H2+ O2 -t-> 2H2O
LTL :
0,15/2 > 0,05/1
=> H2 du
theo pt , nH2O = 2 nO2 = 0,1 (mol)
=> mH2O = 0,1 .18 = 1,8 (g)