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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) 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)
\(n_{HCl}=\dfrac{7,3}{36,5}=0,2\left(mol\right)\)
PTHH: Zn + 2HCl --> ZnCl2 + H2
0,1<---0,2------>0,1--->0,1
=> mZn = 0,1.65 = 6,5(g)
=> VH2 = 0,1.22,4 = 2,24(l)
=> mZnCl2 = 0,1.136 = 13,6(g)
\(n_{Zn}=\dfrac{9,75}{65}=0,15\left(mol\right)\\
pthh:Zn+H_2SO_4\rightarrow ZnSO_4+H_2\)
0,15 0,15 0,15 0,15
\(V_{H_2}=0,15.22,4=3,36L\\
m_{H_2SO_4}=0,15.98=14,7\left(g\right)\\
m_{ZnSO_4}=161.0,15=24,15g\\
\)
\(n_{CuO}=\dfrac{6}{80}=0,075\left(mol\right)\\
pthh:CuO+H_2\underrightarrow{t^o}Cu+H_2O\\
LTL:0,075< 0,15\)
=> H2 dư
\(n_{Cu}=n_{CuO}=0,075\left(mol\right)\\
m_{Cu}=0,075.64=4,8g\)
\(n_{Zn}=\dfrac{13}{65}=0,2(mol)\\ a,Zn+2HCl\to ZnCl_2+H_2\\ \Rightarrow n_{H_2}=0,2(mol);n_{HCl}=0,4(mol)\\ b,m_{HCl}=0,4.36,5=14,6(g)\\ c,V_{H_2}=0,2.24,79=4,958(l)\)
\(a,2Al+3H_2SO_4\rightarrow Al_2\left(SO_4\right)_3+3H_2\\ b,Theo.\text{Đ}LBTKL:\\ m_{Al}+m_{H_2SO_4}=m_{Al_2\left(SO_4\right)_3}+m_{H_2}\\ \Leftrightarrow5,4+29,4=m+0,6\\ \Leftrightarrow m=\left(5,4+29,4\right)-0,6=34,2\left(g\right)\)
a) 2Na + H2SO4 --> Na2SO4 + H2
b) \(n_{Na}=\dfrac{4,6}{23}=0,2\left(mol\right)\)
PTHH: 2Na + H2SO4 --> Na2SO4 + H2
_____0,2------>0,1-------------------->0,1
=> VH2 = 0,1.22,4 = 2,24 (l)
c) mH2SO4 = 0,1.98 = 9,8(g)