cho AL phản ứng với 98g H2SO4 thu được AL2(SO4)3 và H2
a) viet PTHH b) tinh khoi luong AL2(SO4)3C) thinh AL the tich H2 O DKTCHãy nhập câu hỏi của bạn vào đây, nếu là tài khoản VIP, bạn sẽ được ưu tiên trả lời.
\(n_{Al}=\dfrac{10.8}{27}=0.4\left(mol\right)\)
\(n_{H_2SO_4}=\dfrac{22.4}{98}=\dfrac{8}{35}\left(mol\right)\)
\(2Al+3H_2SO_4\rightarrow Al_2\left(SO_4\right)_3+3H_2\)
\(2............3\)
\(0.4..........\dfrac{8}{35}\)
\(LTL:\dfrac{0.4}{2}>\dfrac{\dfrac{8}{35}}{3}\Rightarrow Aldư\)
\(m_{Al\left(dư\right)}=\left(0.4-\dfrac{8}{35}\cdot\dfrac{2}{3}\right)\cdot27=6.68\left(g\right)\)
\(m_{Al_2\left(SO_4\right)_3}=\dfrac{8}{35\cdot3}\cdot342=26.05\left(g\right)\)
\(V_{H_2}=\dfrac{8}{35}\cdot22.4=5.12\left(l\right)\)
2Al + 3H2SO4 \(\rightarrow\)Al2(SO4)3 + 3H2
nAl=\(\dfrac{8,1}{27}=0,3\left(mol\right)\)
Theo PTHH ta có:
\(\dfrac{3}{2}\)nAl=nH2=0,45(mol)
VH2=0,45.22,4=10,08(lít)
\(\dfrac{1}{2}\)nAl=nAl2(SO4)3=0,15(mol)
mAl2(SO4)3=342.0,15=51,3(g)
C% dd Al2(SO4)3=\(\dfrac{51,3}{8,1+200-0,45.2}.100\%=24,75\%\)
\(n_{Al}=\dfrac{5.4}{27}=0.2\left(mol\right)\\ n_{H_2SO_4}=\dfrac{49}{98}=0.5\left(mol\right)\)
\(2Al+3H_2SO_4\rightarrow Al_2\left(SO_4\right)_3+3H_2\)
\(Bđ:0.2..........0.5\)
\(Pư:0.2.........0.3..............0.1............0.3\)
\(Kt:0...........0.2...............0.1.............0.3\)
\(m_{Al_2\left(SO_4\right)_3}=0.1\cdot342=34.2\left(g\right)\)
\(V_{H_2}0.3\cdot22.4=6.72\left(l\right)\)
\(2Al+3H_2SO_4\rightarrow Al_2\left(SO_4\right)_3+3H_2\uparrow\)
\(2:3:1:3\left(mol\right)\)
\(0,1:0,15:0,05:0,15\left(mol\right)\)
\(n_{H_2}=\dfrac{V}{22,4}=\dfrac{3,36}{22,4}=0,15\left(mol\right)\)
\(a,m_{Al}=n.M=0,1.27=2,7\left(kg\right)\)
\(b,m_{Al_2\left(SO_4\right)_3}=n.M=0,05.342=17,1\left(g\right)\)
Sửa: \(14,7\%\)
\(n_{H_2SO_4}=\dfrac{200.14,7\%}{100\%.98}=0,3(mol)\\ a,PTHH:2Al+3H_2SO_4\to Al_2(SO_4)_3+3H_2\\ \Rightarrow n_{H_2}=0,3(mol)\\ \Rightarrow V_{H_2}=0,3.22,4=6,72(l)\\ b,n_{Al}=\dfrac{2}{3}n_{H_2SO_4}=0,2(mol)\\ \Rightarrow m_{Al}=0,2.27=5,4(g)\\ c,n_{Al_2(SO_4)_3}=\dfrac{1}{2}n_{Al}=0,1(mol)\\ \Rightarrow C\%_{Al_2(SO_4)_3}=\dfrac{0,1.342}{200+5,4-0,3.2}.100\%=16,7\%\\ c,m_{Al_2(SO_4)_3}=0,1.342=34,2(g)\)
Ta có: \(n_{H_2}=\dfrac{74,37}{24,79}=3\left(mol\right)\)
PT: \(2Al+3H_2SO_4\rightarrow Al_2\left(SO_4\right)_3+3H_2\)
a, \(n_{Al}=\dfrac{2}{3}n_{H_2}=2\left(mol\right)\)
\(\Rightarrow m_{Al}=2.27=54\left(g\right)\)
b, \(n_{H_2SO_4}=n_{H_2}=3\left(mol\right)\)
\(\Rightarrow m_{H_2SO_4}=3.98=294\left(g\right)\)
PTHH: \(2Al\left(OH\right)_3+3H_2SO_4\rightarrow Al_2\left(SO_4\right)_3+6H_2O\)
Ta có: \(n_{Al\left(OH\right)_3}=\dfrac{7,8}{78}=0,1\left(mol\right)\)
\(\Rightarrow\left\{{}\begin{matrix}n_{H_2SO_4}=0,15mol\\n_{Al_2\left(SO_4\right)_3}=0,05mol\end{matrix}\right.\) \(\Rightarrow\left\{{}\begin{matrix}m_{H_2SO_4}=0,15\cdot98=14,7\left(g\right)\\m_{Al_2\left(SO_4\right)_3}=0,05\cdot342=17,1\left(g\right)\end{matrix}\right.\)
a) pthh: 2Al + 3H2SO4 = Al2(SO4)3 + 3H2
b) mal2(so4)3 = 98.mal2so4 / 3.mh2so4
= 89(54 +240) /246 = 187g Al2(S04)3
c) bn viết k rõ (toán, lý,hóa là phải chính xác từng từ nhe bn)
\(n_{Al}=\dfrac{10,8}{27}=0,4\left(mol\right);n_{H_2SO_4}=\dfrac{98}{98}=1\left(mol\right)\)
PTHH: 2Al + 3H2SO4 --> Al2(SO4)3 + 3H2
Xét tỉ lệ \(\dfrac{0,4}{2}< \dfrac{1}{3}\) => Al hết, H2SO4 dư
PTHH: 2Al + 3H2SO4 --> Al2(SO4)3 + 3H2
_____0,4--->0,6------------------------->0,6
=> nH2SO4 dư = 1-0,6=0,4(mol)
=> VH2 = 0,6.22,4 = 13,44(l)
a) PTHH:
3Al + 3H2SO4 ------->Al(SO4)3 + 3H2