Hãy nhập câu hỏi của bạn vào đây, nếu là tài khoản VIP, bạn sẽ được ưu tiên trả lời.
a. \(PTHH:2Al+3H_2SO_4--->Al_2\left(SO_4\right)_3+3H_2\)
b. Áp dụng định luật bảo toàn khối lượng, ta có:
\(m_{Al}+m_{H_2SO_4}=m_{Al_2\left(SO_4\right)_3}+m_{H_2}\)
\(\Leftrightarrow m_{Al_2\left(SO_4\right)_3}=m_{Al}+m_{H_2SO_4}-m_{H_2}=5,4+29,4-0,6=34,2\left(g\right)\)
`a)`
PTHH : `Fe + 2HCl -> FeCl_2 + H_2`
`b)`
`n_{Fe} = (11,2)/(56) = 0,2` `mol`
`n_{HCl} = 2 . n_{Fe} = 0,4` `mol`
`m_{HCl} = 0,4 . 36,5 = 14,6` `gam`
`c)`
`n_{FeCl_2} = n_{Fe} = 0,2` `mol`
`m_{FeCl_2} = 0,2 . 127 = 25,4` `gam`
`n_{H_2} = n_{Fe} = 0,2` `mol`
`V_{H_2} = 0,2 . 22,4 = 4,48` `l`
\(a,PTHH:2Al+3H_2SO_4\rightarrow Al_2\left(SO_4\right)_3+3H_2\\ n_{H_2}=\dfrac{3,36}{22,4}=0,15\left(mol\right)\\ \Rightarrow n_{Al}=\dfrac{2}{3}n_{H_2}=0,1\left(mol\right)\\ \Rightarrow m_{Al}=0,1\cdot27=2,7\left(g\right)\\ b,n_{H_2SO_4}=n_{H_2}=0,15\left(mol\right)\\ \Rightarrow m_{H_2SO_4}=0,15\cdot98=14,7\left(g\right)\\ c,n_{Al_2\left(SO_4\right)_3}=\dfrac{1}{3}n_{H_2}=0,05\left(mol\right)\\ \Rightarrow m_{Al_2\left(SO_4\right)_3}=0,05\cdot342=17,1\left(g\right)\)
2Al+3H2SO4->Al2(SO4)3+3H2
0,1-------0,15---------------------0,15 mol
n H2=\(\dfrac{3,36}{22,4}\)=0,15 mol
=>m Al=0,1.27=2,7g
=>m H2SO4=0,15.98=14,7g
a, PT: \(2Al+3H_2SO_4\rightarrow Al_2\left(SO_4\right)_3+3H_2\)
b, Ta có: \(n_{H_2}=\dfrac{3,36}{22,4}=0,15\left(mol\right)\)
Theo PT: \(n_{Al}=\dfrac{2}{3}n_{H_2}=0,1\left(mol\right)\)
\(\Rightarrow m_{Al}=0,1.27=2,7\left(g\right)\)
c, Theo PT: \(n_{H_2SO_4}=n_{H_2}=0,15\left(mol\right)\)
\(\Rightarrow m_{H_2SO_4}=0,15.98=14,7\left(g\right)\)
Bạn tham khảo nhé!
a) \(n_{H_2SO_4}=\dfrac{5,88}{98}=0,06\left(mol\right)\)
PTHH: \(2Al+3H_2SO_4\rightarrow Al_2\left(SO_4\right)_3+3H_2\)
0,04<--0,06------->0,02---------->0,06
\(\Rightarrow\left\{{}\begin{matrix}a=m_{Al}=0,04.27=1,08\left(g\right)\\V=V_{H_2}=0,06.22,4=1,344\left(l\right)\end{matrix}\right.\)
b)
Cách 1: \(m=m_{Al_2\left(SO_4\right)_3}=0,02.342=6,84\left(g\right)\)
Cách 2: \(m_{H_2}=0,06.2=0,12\left(g\right)\)
Áp dụng ĐLBTKL:
\(m_{Al}+m_{H_2SO_4}=m_{Al_2\left(SO_4\right)_3}+m_{H_2}\)
\(\Rightarrow m=m_{Al_2\left(SO_4\right)_3}=1,08+5,88-0,12=6,84\left(g\right)\)
c) \(n_{O_2}=\dfrac{1,344}{22,4}=0,06\left(mol\right)\)
PTHH: \(2H_2+O_2\xrightarrow[]{t^o}2H_2O\)
Xét tỉ lệ: \(\dfrac{0,06}{2}< \dfrac{0,06}{1}\Rightarrow\) O2 dư, H2 hết
Theo PTHH: \(n_{O_2\left(p\text{ư}\right)}=\dfrac{1}{2}.n_{H_2}=0,03\left(mol\right)\)
\(\Rightarrow\left\{{}\begin{matrix}n_{O_2\left(d\text{ư}\right)}=0,06-0,03=0,03\left(mol\right)\\m_{O_2\left(d\text{ư}\right)}=0,03.32=0,96\left(g\right)\\V_{O_2\left(d\text{ư}\right)}=0,03.22,4=0,672\left(l\right)\end{matrix}\right.\)
Theo PTHH: \(n_{H_2O}=n_{H_2}=0,06\left(mol\right)\)
\(\Rightarrow m_{H_2O}=0,06.18=1,08\left(g\right)\)
2Al+3H2SO4->Al2(SO4)3+3H2
0,1----------------------0,075----0,15
n H2=0,15 mol
=>mAl=0,1.27=2,7g
=>m Al2(SO4)3=0,075.342=25,65g
a) PTHH: \(2Al+3H_2SO_2\rightarrow Al_2\left(SO_4\right)_3+3H_2\)
b) \(n_{H_2}=\dfrac{3,36}{22,4}=0,15\left(mol\right)\)
\(n_{Al}=\dfrac{2}{3}.0,15=0,1\left(mol\right)\)
\(m_{Al}=0,1.27=2,7\left(g\right)\)
c) \(n_{Al_2\left(SO_4\right)_3}=\dfrac{1}{2}.0,1=0,05\left(mol\right)\)
\(m_{Al_2\left(SO_4\right)_3}=0,05.342=17,1\left(g\right)\)
`a)`
PTHH : `2Al + 3H_2SO_4 -> Al_2(SO_4)_3 + 3H_2`
`b)`
`n_{H_2} = (3,36)/(22,4) = 0,15` `mol`
`n_{H_2SO_4} = n_{H_2} = 0,15` `mol`
`m_{H_2SO_4} = 0,15 . 98 = 14,7` `gam`
`c)`
`n_{Al_2(SO_4)_3} = 1/3 . n_{H_2} = 0,05` `mol`
`m_{Al_2(SO_4)_3} = 0,05 . 342 = 17,1` `gam`