Hãy nhập câu hỏi của bạn vào đây, nếu là tài khoản VIP, bạn sẽ được ưu tiên trả lời.
a, \(n_{Fe}=\dfrac{0,56}{56}=0,01\left(mol\right)\)
PT: \(Fe+H_2SO_4\rightarrow FeSO_4+H_2\)
Theo PT: \(n_{FeSO_4}=n_{H_2}=n_{Fe}=0,01\left(mol\right)\)
\(\Rightarrow m_{FeSO_4}=0,01.152=1,52\left(g\right)\)
\(V_{H_2}=0,01.22,4=0,224\left(l\right)\)
b, \(n_{H_2SO_4}=n_{Fe}=0,01\left(mol\right)\Rightarrow m_{ddH_2SO_4}=\dfrac{0,01.98}{19,6\%}=5\left(g\right)\)
c, Ta có: m dd sau pư = 0,56 + 5 - 0,01.2 = 5,54 (g)
\(\Rightarrow C\%_{FeSO_4}=\dfrac{1,52}{5,54}.100\%\approx27,44\%\)
\(a,n_{Zn}=\dfrac{1,3}{65}=0,02\left(mol\right)\)
PTHH: Zn + H2SO4 ---> ZnSO4 + H2
0,02--->0,02--------->0,02----->0,02
b, mZnSO4 = 0,02.161 = 3,22 (g)
c, VH2 = 0,02.22,4 = 0,448 (l)
d, \(m_{ddH_2SO_4}=\dfrac{0,02.98}{10\%}=19,6\left(g\right)\)
e, mdd = 19,6 + 1,3 - 0,02.2 = 20,86 (g)
=> \(C\%_{ZnSO_4}=\dfrac{0,02.161}{20,86}.100\%=15,44\%\)
a, Ta có:
nZn = 13/65= 0,2(mol)
PTHH: Zn + H2SO4 → ZnSO4 + H2
0,2-----------------------------------0,2
Theo PT : nZnSO4 = 0,2.1/1 = 0,2(mol)
mZnSO4 = 0,2. 161 = 32,2(g)
b, Ta có:
Theo PT : nH2 = 0,2.1/1 = 0,2(mol)
VH2(đktc) = 0,2 . 22,4 = 4,48(l)
CuO+H2-to>Cu+H2O
0,2-----0,2
=>m Cu=0,2.64=12,8g
Cậu ơi cho tớ hỏi ngu tý là cái mà "0,2---------0,2" là ntn vậy ạ :"))?
a. 2Al + 6HCl -> 2AlCl3 + 3H2
b. nAl = \(\dfrac{8.1}{27}=0,3\left(mol\right)\)=> \(n_{H_2}=\dfrac{3}{2}.0,3=0,45\left(mol\right)\)
\(V_{H_2}=0,45.22,4=10,08\left(mol\right)\)
a, \(Zn+H_2SO_4\rightarrow ZnSO_4+H_2\)
b, \(n_{Zn}=\dfrac{19,5}{65}=0,3\left(mol\right)\)
Theo PT: \(n_{H_2}=n_{Zn}=0,3\left(mol\right)\Rightarrow V_{H_2}=0,3.22,4=6,72\left(l\right)\)
c, \(n_{ZnSO_4}=n_{Zn}=0,3\left(mol\right)\Rightarrow m_{ZnSO_4}=0,3.161=48,3\left(g\right)\)
d, \(n_{Fe_2O_3}=\dfrac{64}{160}=0,4\left(mol\right)\)
PT: \(Fe_2O_3+3H_2\underrightarrow{t^o}2Fe+3H_2O\)
Xét tỉ lệ: \(\dfrac{0,4}{1}>\dfrac{0,3}{3}\), ta được Fe2O3 dư.
Mà: H% = 30% \(\Rightarrow n_{H_2\left(pư\right)}=0,3.30\%=0,09\left(mol\right)\)
Theo PT: \(\left\{{}\begin{matrix}n_{Fe}=\dfrac{2}{3}n_{H_2}=0,06\left(mol\right)\\n_{Fe_2O_3\left(pư\right)}=\dfrac{1}{3}n_{H_2}=0,03\left(mol\right)\end{matrix}\right.\)
\(\Rightarrow n_{Fe_2O_3\left(dư\right)}=0,4-0,03=0,37\left(mol\right)\)
\(\Rightarrow a=m_{Fe}+m_{Fe_2O_3\left(dư\right)}=62,56\left(g\right)\)
a)
$Zn + 2HCl \to ZnCl_2 + H_2$
b)
n Zn = 13/65 = 0,2(mol)
n HCl = 2n Zn = 0,4(mol)
m HCl = 0,4.36,5 = 14,6(gam)
c)
m dd HCl = 14,6/3,65% = 400(gam)
d)
n H2 = n Zn = 0,2(mol)
V H2 = 0,2.22,4 = 4,48(lít)
a, nZn = 26/65 = 0,4 (mol)
PTHH: Zn + 2HCl -> ZnCl2 + H2
nZn = nH2 = 0,4 (mol)
VH2 = 0,4 . 22,4 = 8,96 (l)
b, nFe2O3 = 16/160 = 0,1 (mol)
PTHH: Fe2O3 + 3H2 -> (t°) 2Fe + 3H2O
LTL: 0,1 < 0,4/3 => H2 dư
nFe = 0,1 . 3 = 0,3 (mol)
mFe = 0,3 . 56 = 16,8 (g)
a) \(n_{Zn}=\dfrac{26}{65}=0,4\left(mol\right)\)
PTHH: Zn + 2HCl --> ZnCl2 + H2
0,4--------------------->0,4
=> VH2 = 0,4.22,4 = 8,96 (l)
b)
\(n_{Fe_2O_3}=\dfrac{16}{160}=0,1\left(mol\right)\)
PTHH: Fe2O3 + 3H2 --to--> 2Fe + 3H2O
Xét tỉ lệ: \(\dfrac{0,1}{1}< \dfrac{0,4}{3}\) => Fe2O3 hết, H2 dư
PTHH: Fe2O3 + 3H2 --to--> 2Fe + 3H2O
0,1---------------->0,2
=> mFe = 0,2.56 = 11,2 (g)
\(n_{Mg}=\dfrac{4,8}{24}=0,2\left(mol\right)\\ pthh:Mg+2HCl\rightarrow MgCl_2+H_2\)
0,2 0,4 0,2
\(\Rightarrow m_{HCl}=0,4.36,5=14,6\left(g\right)\\ V_{H_2}=0,2.22,4=4,48\left(l\right)\\ pthh:FeO+H_2\underrightarrow{t^o}Fe+H_2O\)
0,2 0,2 0,2
\(m_{Fe}=0,2.56=11,2\left(g\right)\)
\(n_{H_2SO_4}=\dfrac{m}{M}=\dfrac{19,6}{2+32+16\cdot4}=0,2\left(mol\right)\\ PTHH:Zn+H_2SO_4->ZnSO_4+H_2\)
tỉ lệ: 1 : 1 : 1 : 1
n(mol) 0,2<---0,2------>0,2-------->0,2
\(m_{ZnSO_4}=n\cdot M=0,2\cdot\left(65+32+16\cdot4\right)=32,2\left(g\right)\\ V_{H_2\left(dktc\right)}=n\cdot22,4=0,2\cdot22,4=4,48\left(l\right)\)