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a) Mg + H2SO4 --> MgSO4 + H2
b) \(n_{Mg}=\dfrac{14,4}{24}=0,6\left(mol\right)\)
PTHH: Mg + H2SO4 --> MgSO4 + H2
0,6--->0,6------->0,6----->0,6
=> \(m_{H_2SO_4}=0,6.98=58,8\left(g\right)\)
c)
PTHH: 2H2 + O2 --to--> 2H2O
0,6-->0,3
=> VO2 = 0,3.24,79 = 7,437 (l)
=> Vkk = 7,437.5 = 37,185 (l)
nMg = 2,88/24 = 0,12 (mol)
PTHH: Mg + H2SO4 -> MgSO4 + H2
Mol: 0,12 ---> 0,12 ---> 0,12 ---> 0,12
mH2SO4 = 0,12 . 98 = 11,76 (g)
PTHH: 2H2 + O2 -> (t°) 2H2O
Mol: 0,12 ---> 0,06
Vkk = 0,06 . 5 . 24,79 = 7,437 (l)
a, Magnesium + Sulfuric acid → Magnesium sulfate + Hydrogen
b, BTKL: mMg + mH2SO4 = mMgSO4 + mH2
c, Từ b, có: mH2SO4 = mMgSO4 + mH2 - mMg = 27,2 + 0,4 - 13 = 14,6 (g)
\(n_{Al}=\dfrac{2,7}{27}=0,1mol\\ a.2Al+3H_2SO_4\rightarrow Al_2\left(SO_4\right)_3+3H_2\)
0,1 0,15 0,05 0,15
\(b.V_{H_2}=0,15.24,79=3,7185l\\ c.m_{Al_2\left(SO_4\right)_3}=0,05.342=17,1g\\ d.C_{M_{H_2SO_4}}=\dfrac{0,15}{0,4}=0,375M\)
a.\(n_{Mg}=\dfrac{4,8}{24}=0,2mol\)
\(Mg+2HCl\rightarrow MgCl_2+H_2\)
0,2 0,2 ( mol )
\(V_{H_2}=0,2.24,79=4,958l\)
b.\(n_{Na}=\dfrac{6,9}{23}=0,3mol\)
\(2Na+2H_2O\rightarrow2NaOH+H_2\)
0,3 0,15 ( mol )
\(V_{H_2}=0,15.24,79=3,7185l\)
c.\(2Al+3H_2SO_4\rightarrow Al_2\left(SO_4\right)_3+3H_2\)
0,05 0,075 ( mol )
\(V_{H_2}=0,075.24,79=1,85925l\)
\(n_{Fe}=\dfrac{6,72}{56}=0,12\left(mol\right)\\ Fe+H_2SO_{4\left(loãng\right)}\rightarrow FeSO_4+H_2\uparrow\\ Mol:0,12\rightarrow0,12\rightarrow0,12\rightarrow0,12\\ V_{H_2}=0,12.22,4=2,688\left(l\right)\\ m_{FeSO_4}=0,12.152=18,24\left(g\right)\\ PTHH:Fe_2O_3+3H_2\underrightarrow{t^o}2Fe+3H_2O\\ Mol:0,04\leftarrow0,12\rightarrow0,08\\ m_{Fe}=0,08.56=4,48\left(g\right)\)
\(n_{Mg}=\dfrac{3,6}{24}=0,15\left(mol\right)\)
PTHH: Mg + 2HCl ---> MgCl2 + H2
0,15--------------->0,15---->0,15
CuO + H2 --to--> Cu + H2O
0,15------->0,15
=> \(\left\{{}\begin{matrix}m_{MgCl_2}=0,15.95=14,25\left(g\right)\\V_{H_2}=0,15.24,79=3,7195\left(l\right)\\m_{Cu}=0,15.64=9,6\left(g\right)\end{matrix}\right.\)
\(n_{Mg}=\dfrac{3,6}{24}=0,15\left(mol\right)\\
pthh:Mg+2HCl\rightarrow MgCl_2+H_2\uparrow\)
0,15 0,15 0,15
\(m_{MgCl_2}=0,15.95=14,25\left(g\right)\\
V_{H_2}=0,3.22,4=3,36\left(L\right)\\
pthh:CuO+H_2\underrightarrow{t^o}Cu+H_2O\)
0,3 0,3 0,3
\(m_{Cu}=0,3.64=19,2\left(g\right)\)
b) mH2SO4 ban đầu là bao nhiêu :) ?
cái đề nó vậy ạ :((