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\(m_{CuO}=50.20\%=10\left(g\right)\)
\(n_{CuO}=\dfrac{10}{80}=0,125\left(mol\right)\)
\(m_{Fe_2O_3}=50-10=40\left(g\right)\)
\(n_{Fe_2O_3}=\dfrac{40}{160}=0,25\left(mol\right)\)
PTHH :
\(CuO+H_2\underrightarrow{t^o}Cu+H_2O\)
0,125 0,125 0,125
\(Fe_2O_3+3H_2\underrightarrow{t^o}2Fe+3H_2O\)
0,25 0,75 0,5
\(a,V_{H_2}=\left(0,75+0,125\right).22,4=19,6\left(l\right)\)
\(b,m_{Cu}=0,125.64=8\left(g\right)\)
\(m_{Fe}=0,5.56=28\left(g\right)\)
\(m_{CuO}=40.20\%=8\left(g\right)\)
\(n_{CuO}=\dfrac{8}{80}=0,1\left(mol\right)\)
\(n_{Fe_2O_3}=\dfrac{40-8}{160}=0,2\left(mol\right)\)
PTHH:
\(CuO+H_2\underrightarrow{t^o}Cu+H_2O\)
0,1 0,1
\(Fe_2O_3+3H_2\underrightarrow{t^o}2Fe+3H_2O\)
0,2 0,6
\(V_{H_2}=\left(0,1+0,6\right).22,4=15,68\left(l\right)\)
_ \(m_{Fe_2O_3}=0,8.50=40\left(g\right)\) \(\Rightarrow m_{CuO}=50-40=10\left(g\right)\)
_ \(n_{Fe_2O_3}=\dfrac{40}{160}=0,25mol\); \(n_{CuO}=\dfrac{10}{80}=0,125mol\)
PTHH: \(3H_2+Fe_2O_3\rightarrow2Fe+3H_2O\)
_____0,75mol_0,25mol
\(H_2+CuO\rightarrow Cu+H_2O\)
0,125__0,125 (mol)
\(\Rightarrow V_{H_2}=\left(0,75+0,125\right)22,4=19,6l\)
\(n_{Fe_2O_3}=\dfrac{16}{160}=0,1\left(mol\right)\)
PTHH: Fe2O3 + 3H2 --to--> 2Fe + 3H2O
0,1 0,3 0,2
\(V_{H_2}=0,3.22,4=6,72\left(l\right)\)
\(n_{O_2}=\dfrac{2,24}{22,4}=0,1\left(mol\right)\)
PTHH: 3Fe + 2O2 --to--> Fe3O4
LTL: \(\dfrac{0,2}{3}>\dfrac{0,1}{2}\rightarrow\) Fe dư
Theo pthh: \(n_{Fe\left(pư\right)}=\dfrac{3}{2}n_{O_2}=\dfrac{3}{2}.0,1=0,15\left(mol\right)\)
\(\rightarrow m_{Fe\left(dư\right)}=\left(0,2-0,15\right).56=2,8\left(g\right)\)
a.\(n_{Fe_2O_3}=\dfrac{16}{160}=0,1mol\)
\(Fe_2O_3+3H_2\rightarrow\left(t^o\right)2Fe+3H_2O\)
0,1 0,3 0,2 ( mol )
\(V_{H_2}=0,3.22,4=6,72l\)
b.\(n_{O_2}=\dfrac{2,24}{22,4}=0,1mol\)
\(3Fe+2O_2\rightarrow\left(t^o\right)Fe_3O_4\)
\(\dfrac{0,2}{3}\) > \(\dfrac{0,1}{2}\) ( mol )
0,15 0,1 ( mol )
Chất dư là Fe
\(m_{Fe\left(dư\right)}=\left(0,2-0,15\right).56=2,8g\)
\(\left\{{}\begin{matrix}m_{CuO}=50.20\%=10\left(g\right)\\m_{Fe_2O_3}=50-10=40\left(g\right)\end{matrix}\right.\Rightarrow\left\{{}\begin{matrix}n_{CuO}=\dfrac{10}{80}=0,125\left(mol\right)\\n_{Fe_2O_3}=\dfrac{40}{160}=0,25\left(mol\right)\end{matrix}\right.\)
PTHH:
\(CuO+H_2\xrightarrow[]{t^o}Cu+H_2O\)
0,125->0,125
\(Fe_2O_3+3H_2\xrightarrow[]{t^o}2Fe+3H_2\)
0,25--->0,75
\(\Rightarrow V_{H_2}=\left(0,75+0,125\right).22,4=18,2\left(l\right)\)
nFe = 46,4/56 = 29/35 (mol)
PTHH: 4Fe + 3O2 -> (t°) 2Fe2O3
Mol: 29/35 ---> 87/140 ---> 29/70
mFe2O3 = 29/70 . 160 = 464/7 (g)
Vkk = 87/140 . 5 . 22,4 = 69,6 (l)
\(n_{Fe}=\dfrac{2,8}{56}=0,05mol\)
\(\Rightarrow m_{Cu}=6-2,8=3,2g\)\(\Rightarrow n_{Cu}=0,05mol\)
\(CuO+H_2\rightarrow Cu+H_2O\)
0,05 0,05
\(Fe_2O_3+3H_2\rightarrow2Fe+3H_2O\)
0,075 0,05
\(\Rightarrow\Sigma n_{H_2}=0,075+0,05=0,125mol\)
\(\Rightarrow V=0,125\cdot22,4=2,8l\)
CHÚC BẠN HỌC TỐT
a) Theo đề bài, ta có: \(n_{O2}=\dfrac{20}{32}=0,625\left(mol\right)\)
PTHH: \(2H_2+O_2\underrightarrow{o}2H_2O\)
pư............1.........0,5......1 (mol)
Ta có tỉ lệ: \(\dfrac{1}{2}< 0,625\). Vậy O2 dư, H2 hết.
\(\Rightarrow m_{H2O}=18.1=18\left(g\right)\)
Vậy.........