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\(n_{Al}=\dfrac{16,2}{27}=0,6\left(mol\right)\)
2Al + 3H2SO4 ---> Al2(SO4)3 + 3H2
0,6 0,9 0,3 0,9
\(\rightarrow V_{H_2}=0,9.22,4=20,16\left(l\right)\)
\(n_{Cu}=\dfrac{57}{64}=0,890625\left(mol\right)\)
PTHH: CuO + H2 --to--> Cu + H2O
0,890625 0,890625
\(H=\dfrac{0,890625}{0,9}=99\%\)
a: \(2Al+3H_2SO_4\rightarrow Al_2\left(SO_4\right)_3+3H_2\)
b: \(n_{H2}=\dfrac{3.36}{22.4}=0.15\left(mol\right)\)
\(\Leftrightarrow n_{Al}=0.1\left(mol\right)\)
\(m_{Al}=n_{Al}\cdot M_{Al}=0.1\cdot27=2.7\left(g\right)\)
a.b.c.\(n_{Al}=\dfrac{2,7}{27}=0,1mol\)
\(2Al+6HCl\rightarrow2AlCl_3+3H_2\)
0,1 0,1 0,15 ( mol )
\(V_{H_2}=0,15.22,4=3,36l\)
\(m_{AlCl_3}=0,1.133,5=13,35g\)
d.\(Fe_2O_3+3H_2\rightarrow\left(t^o\right)2Fe+3H_2O\)
0,15 0,1 ( mol )
\(m_{Fe}=0,1.56=5,6g\)
\(n_{Al2O3}=\dfrac{20,4}{102}=0,2\left(mol\right)\)
Pt : \(Al_2O_3+3H_2SO_4\rightarrow Al_2\left(SO_4\right)_3+3H_2O|\)
1 3 1 3
0,2 0,6 0,2
\(n_{H2SO4}=\dfrac{0,2.3}{1}=0,6\left(mol\right)\)
⇒ \(m_{H2SO4}=0,6.98=58,8\left(g\right)\)
\(n_{Al2\left(SO4\right)3}=\dfrac{0,6.1}{3}=0,2\left(mol\right)\)
⇒ \(m_{Al2\left(SO4\right)3}=0,2.342=68,4\left(g\right)\)
Chúc bạn học tốt
\(n_{Fe}=\dfrac{5,6}{56}=0,1\left(mol\right)\\ PTHH:Fe+2HCl\rightarrow FeCl_2+H_2\\ n_{H_2}=n_{FeCl_2}=n_{Fe}=0,1\left(mol\right);n_{HCl}=2.0,1=0,2\left(mol\right)\\ a,V_{H_2\left(đktc\right)}=0,1.22,4=2,24\left(l\right)\\ b,m_{HCl}=0,2.36,5=7,3\left(g\right)\\ m_{FeCl_2}=127.0,1=12,7\left(g\right)\)
Cái khí ở dạng phân tử nên là H2 chứ không phải H em nha!
a, \(n_{Mg}=\dfrac{2,4}{24}=0,1\left(mol\right)\)
\(m_{HCl}=36,5.15\%=5,475\left(g\right)\Rightarrow n_{HCl}=\dfrac{5,475}{36,5}=0,15\left(mol\right)\)
PT: \(Mg+2HCl\rightarrow MgCl_2+H_2\)
Xét tỉ lệ: \(\dfrac{0,1}{1}>\dfrac{0,15}{2}\), ta được Mg dư.
Theo PT: \(n_{H_2}=\dfrac{1}{2}n_{HCl}=0,075\left(mol\right)\Rightarrow V_{H_2}=0,075.22,4=1,68\left(l\right)\)
b, \(n_{Mg\left(pư\right)}=\dfrac{1}{2}n_{HCl}=0,075\left(mol\right)\Rightarrow n_{Mg\left(dư\right)}=0,1-0,075=0,025\left(mol\right)\)
\(\Rightarrow m_{Mg\left(dư\right)}=0,025.24=0,6\left(g\right)\)
c, - Cách 1:
\(n_{MgCl_2}=\dfrac{1}{2}n_{HCl}=0,075\left(mol\right)\Rightarrow m_{MgCl_2}=0,075.95=7,125\left(g\right)\)
- Cách 2:
Theo ĐLBT KL, có: mMg (pư) + mHCl = mMgCl2 + mH2
⇒ mMgCl2 = 2,4 - 0,6 + 5,475 - 0,075.2 = 7,125 (g)
\(n_{Fe}=\dfrac{16.8}{56}=0.3\left(mol\right)\)
\(Fe+2HCl\rightarrow FeCl_2+H_2\)
\(0.3....................0.3.........0.3\)
\(m_{FeCl_2}=0.3\cdot127=38.1\left(g\right)\)
\(V_{H_2}=0.6\cdot22.4=6.72\left(l\right)\)
\(CuO+H_2\underrightarrow{t^0}Cu+H_2O\)
\(.......0.3...0.3\)
\(m_{Cu}=0.3\cdot64=19.2\left(g\right)\)
PT: \(Fe+2HCl\rightarrow FeCl_2+H_2\)
a, Ta có: \(n_{Fe}=\dfrac{16,8}{56}=0,3\left(mol\right)\)
Theo PT: \(n_{FeCl_2}=n_{Fe}=0,3\left(mol\right)\)
\(\Rightarrow m_{FeCl_2}=0,3.127=38,1\left(g\right)\)
b, Theo PT: \(n_{H_2}=n_{Fe}=0,3\left(mol\right)\)
\(\Rightarrow V_{H_2}=0,3.22,4=6,72\left(l\right)\)
c, PT: \(CuO+H_2\underrightarrow{t^o}Cu+H_2O\)
Theo PT: \(n_{Cu}=n_{H_2}=0,3\left(mol\right)\)
\(\Rightarrow m_{Cu}=0,3.64=19,2\left(g\right)\)
Bạn tham khảo nhé!
\(nMg=\dfrac{12}{24}=0,5\left(mol\right)\)
\(nH_2SO_4=\dfrac{29,4}{98}=0,3\left(mol\right)\)
\(Mg+H_2SO_4\rightarrow MgSO_4+H_2\)
1 1 1 1 (mol)
0,3 0,3 0,3 0,3 (mol)
LTL : 0,5/1 > 0,3/1
=> Mg dư , H2SO4 đủ
\(VH_2=0,3.22,4=6,72\left(l\right)\)
m muối là mMgSO4
=> \(m\left(muối\right)=mMgSO_4=0,3.120=36\left(g\right)\)
Bài 1)
a \(Fe_2O_3+3H_2SO_4\rightarrow Fe_2\left(SO_4\right)_3+3H_2O\)
\(n_{Fe_2O_3}=\frac{4,8}{216}\approx\text{0,02 (mol)}\)
\(Fe_2O_3+3H_2SO_4\rightarrow Fe_2\left(SO_4\right)_3+3H_2O\)
0,02 0,06
\(m_{H_2SO_4}=98\cdot0,06=5,88\left(g\right)\)
b) \(m_{Fe_2\left(SO_4\right)_3}=0,02\cdot400=\text{290.24}\left(g\right)\)
Câu 2 mai làm
Câu 2
a)\(2Al+3H_2SO_4\rightarrow Al_2\left(SO_4\right)_3+H_2\)
\(n_{Al}=\frac{5,4}{2,7}=0,2\left(mol\right)\)
\(2Al+3H_2SO_4\rightarrow Al_2\left(SO_4\right)_3+H_2\)
0,4 mol 0,6 mol 0,2 mol
\(V_{H_2}=0,2\cdot22,4=4,48\left(l\right)\)
b) \(m_{H_2SO_4}=0,6\cdot98=58,8\left(g\right)\)