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\(n_{Al}=\dfrac{5,4}{27}=0,2\left(mol\right)\\ 2Al+3H_2SO_4\rightarrow Al_2\left(SO_4\right)_3+3H_2\\ 0,2........0,3...........0,1...........0,3\left(mol\right)\\ a.C_{MddH_2SO_4}=\dfrac{0,3}{0,3}=1\left(M\right)\\ b.m_{Al_2\left(SO_4\right)_3}=342.0,1=34,2\left(g\right)\\ c.V_{H_2\left(đktc\right)}=0,3.22,4=6,72\left(l\right)\)
PTHH: \(2Al+3H_2SO_4\rightarrow Al_2\left(SO_4\right)_3+3H_2\)
a) \(n_{Al}=\dfrac{5,4}{27}=0,2\left(mol\right)\)
\(n_{H_2SO_4}=\dfrac{3}{2}n_{Al}=0,3\left(mol\right)\)
\(\Rightarrow C_{M_{H_2SO_4}}=\dfrac{0,3}{0,3}=1M\)
b) \(n_{Al_2\left(SO_4\right)_3}=\dfrac{1}{2}n_{Al}=0,1\left(mol\right)\)
\(\Rightarrow m_{Al_2\left(SO_4\right)_3}=n.M=0,1.342=34,2\left(g\right)\)
c) \(n_{H_2}=n_{H_2SO_4}=0,3\left(mol\right)\)
\(\Rightarrow V_{H_2}=n.22,4=0,3.22,4=6,72\left(l\right)\)
\(n_{Mg}=\dfrac{4,8}{24}=0,2\left(mol\right)\\ Mg+H_2SO_4\rightarrow MgSO_4+H_2\\ n_{MgSO_4}=n_{H_2}=n_{H_2SO_4}=n_{Mg}=0,2\left(mol\right)\\ a,m_{MgSO_4}=120.0,2=24\left(g\right)\\ b,V_{H_2\left(đkc\right)}=24,79.0,2=4,958\left(l\right)\\ c,Oxide:A_2O_x\left(x:hoá.trị.A\right)\\ A_2O_x+xH_2SO_4\rightarrow A_2\left(SO_4\right)_x+xH_2O\\ n_{Oxide}=\dfrac{\dfrac{3}{4}.0,2.1}{x}=\dfrac{0,15}{x}\left(mol\right)\\ M_{A_2O_x}=\dfrac{8}{\dfrac{0,15}{x}}=\dfrac{160}{3}x\)
Xét x=1;x=2;x=3;x=8/3 thấy x=3 (TM) khi đó KLR oxide là 160g/mol
\(M_{M_2O_3}=2M_M+3.16=160\left(\dfrac{g}{mol}\right)\\ \Rightarrow M_M=\dfrac{160-48}{2}=56\left(\dfrac{g}{mol}\right)\)
Nên: M là sắt (Fe=56)
Oxide CTHH: Fe2O3
\(n_{Zn}=\dfrac{9,75}{65}=0,15\left(mol\right)\)
\(n_{HCl}=\dfrac{14,6}{36,5}=0,4\left(mol\right)\)
Pt : \(Zn+2HCl\rightarrow ZnCl_2+H_2|\)
1 2 1 1
0,15 0,4 0,15
a) Lập tỉ số so sánh : \(\dfrac{0,15}{1}< \dfrac{0,4}{2}\)
⇒ Zn phản ứng hết , HCl dư
⇒ Tinsht toán dựa vào số mol của zn
\(n_{HCl\left(dư\right)}=0,4-\left(0,15.2\right)=0,1\left(mol\right)\)
⇒ \(m_{HCl\left(dư\right)}=0,1.36,5=3,65\left(g\right)\)
b) \(n_{H2}=\dfrac{0,15.1}{1}=01,5\left(mol\right)\)
\(V_{H2\left(dktc\right)}=0,15.24,79=3,1875\left(l\right)\)
Chúc bạn học tốt
a)
\(n_{H_2}=\dfrac{9,916}{24,79}=0,4\left(mol\right)\)
PTHH: Zn + H2SO4 --> ZnSO4 + H2
_____0,4<---0,4<--------0,4<----0,4
=> mZn = 0,4.65 = 26 (g)
=> \(\left\{{}\begin{matrix}\%Zn=\dfrac{26}{51,6}.100\%=50,388\%\\\%Cu=\dfrac{51,6-26}{51,6}.100\%=49,612\text{%}\end{matrix}\right.\)
b)
mZnSO4 = 0,4.161 = 64,4 (g)
c)
\(V_{ddH_2SO_4}=\dfrac{0,4}{2}=0,2\left(l\right)\)
\(m_{ct}=\dfrac{20.14,7}{100}=2,94\left(g\right)\)
\(n_{H2SO4}=\dfrac{2,94}{98}=0,03\left(mol\right)\)
Pt : \(Zn+H_2SO_4\rightarrow ZnSO_4+H_2|\)
1 1 1 1
0,03 0,03 0,03
\(n_{Zn}=\dfrac{0,03.1}{1}=0,03\left(mol\right)\)
⇒ \(m_{Zn}=0,03.65=1,95\left(g\right)\)
\(n_{H2}=\dfrac{0,03.1}{1}=0,03\left(mol\right)\)
\(V_{H2\left(dktc\right)}=0,03.22,4=0,672\left(l\right)\)
⇒ Chọn câu : D
Chúc bạn học tốt