Hãy nhập câu hỏi của bạn vào đây, nếu là tài khoản VIP, bạn sẽ được ưu tiên trả lời.
\(n_{CuO}=\dfrac{8}{80}=0,1\left(mol\right)\)
a) Pt : \(CuO+2HCl\rightarrow CuCl_2+H_2O|\)
1 2 1 1
0,1 0,2 0,1
b) \(n_{HCl}=\dfrac{0,1.2}{1}=0,2\left(mol\right)\)
⇒ \(m_{HCl}=0,2.36,5=7,3\left(g\right)\)
\(C_{ddHCl}=\dfrac{7,3.100}{200}=3,65\)0/0
c) \(n_{CuCl2}=\dfrac{0,2.1}{2}=0,1\left(mol\right)\)
⇒ \(m_{CuCl2}=0,1.135=13,5\left(g\right)\)
Chúc bạn học tốt
\(n_{CuO}=\dfrac{32}{80}=0,4(mol)\\ CuO+2HCl\to CuCl_2+H_2\\ \Rightarrow n_{HCl}=0,8(mol);n_{CuCl_2}=n_{H_2}=0,4(mol)\\ a,m_{dd_{HCl}}=\dfrac{0,8.36,5}{20\%}=146(g)\\ b,m_{CuCl_2}=0,4.135=54(g)\\ c,C\%_{CuCl_2}=\dfrac{54}{32+146-0,4.2}.100\%=30,47\%\)
\(CuO + 2HCl \rightarrow CuCl_2 + H_2O\)
\(n_{CuO}= \dfrac{32}{80}= 0,4 mol\)
Theo PTHH:
\(n_{HCl}= 2n_{CuO}= 0,8 mol\)
\(\Rightarrow m_{HCl}= 0,8 . 36,5=29,2 g\)
\(\rightarrow m_{dd HCl}= \dfrac{29,2 . 100%}{20%}= 146 g\)
b) Muối tạo thành là CuCl2
Theo PTHH:
\(n_{CuCl_2}= n_{CuO}= 0,4 mol\)
\(\Rightarrow m_{CuCl_2}= 0,4 . 135= 54g\)
c)
\(m_{dd sau pư}= m_{CuO} + m_{dd HCl}= 32 + 146=178 g\)
C%= \(\dfrac{54}{178} . 100\)%= 30,337 %
nCuO=16/80=0,2(mol)
a) PTHH: CuO + H2SO4 -> CuSO4 + H2O
0,2___________0,2_____0,2(mol)
b) mCuSO4=160.0,2=32(g)
c) mH2SO4=0,2.98=19,6(g)
=>C%ddH2SO4= (19,6/100).100=19,6%
\(n_{Al}=\dfrac{21,6}{27}=0,8\left(mol\right)\)
Pt : \(2Al+3H_2SO_4\rightarrow Al_2\left(SO_4\right)_3+3H_2O|\)
2 3 1 3
0,8 1,2 0,4 1,2
a) \(n_{H2}=\dfrac{0,8.3}{2}=1,2\left(mol\right)\)
\(V_{H2\left(dktc\right)}=1,2.22,4=26,88\left(l\right)\)
b) \(n_{H2SO4}=\dfrac{0,8.3}{2}=1,2\left(mol\right)\)
⇒ \(m_{H2SO4}=1,2.98=117,6\left(g\right)\)
\(m_{ddH2SO4}=\dfrac{117,6.100}{29,4}=400\left(g\right)\)
c) \(n_{Al2\left(SO4\right)3}=\dfrac{1,2.1}{3}=0,4\left(mol\right)\)
⇒ \(m_{Al2\left(SO4\right)3}=0,4.342=136,8\left(g\right)\)
\(m_{ddspu}=21,6+400-\left(1,2.2\right)=419,2\left(g\right)\)
\(C_{Al2\left(SO4\right)3}=\dfrac{136,8.100}{419,2}=32,63\)0/0
Chúc bạn học tốt
nH2SO4= 2.0,05=0,1(mol)
PTHH: 2 NaOH + H2SO4 -> Na2SO4 + 2 H2O
a) nNaOH= 0,1.2=0,2(mol) => mNaOH=0,2.40=8(g)
=>mddNaOH= 8/20%= 40(g)
b) nNa2SO4=nH2SO4=0,1(mol)
=> mNa2SO4=142.0,1=14,2(g)
a) Đặt: nZn=x(mol); nFe= y(mol) (x,y: nguyên, dương)
Zn + H2SO4 -> ZnSO4 + H2
x_______x_______x________x
Fe + H2SO4 -> FeSO4 + H2
y____y_________y___y(mol)
b) m(rắn)=mCu=3(g)
=> m(Zn, Fe)= 21,6 - 3= 18,6(g)
Ta có hpt:
\(\left\{{}\begin{matrix}65x+56y=18,6\\22,4x+22,4y=6,72\end{matrix}\right.\Leftrightarrow\left\{{}\begin{matrix}x=0,2\\y=0,1\end{matrix}\right.\)
=> Zn= 65.0,2=13(g)
=>%mZn= (13/21,6).100=60,185%
%mCu=(3/21,6).100=13,889%
=>%mFe=25,926%
c) nH2SO4=x+y=0,3(mol) =>mH2SO4=29,4(g)
=> mddH2SO4= (29,4.100)/25=117,6(g)
nAl= 0,5(mol)
a) PTHH: 2 Al + 6 HCl -> 2 AlCl3 + 3 H2
nHCl= 6/2 . 0,5= 1,5(mol)
=>mHCl= 1,5.36,5=54,75(mol)
=> mddHCl= (54,75.100)/18,25=300(g)
b) nH2= 3/2. 0,5=0,75(mol)
=>V(H2,đktc)=0,75.22,4=16,8(l)
c) nAlCl3= nAl= 0,5(mol) -> mAlCl3=0,5. 133,5=66,75(g)
mddAlCl3=mAl+ mddHCl - mH2= 13,5 + 300-0,75.2=312(g)
=> \(C\%ddAlCl3=\dfrac{66,75}{312}.100\approx21,394\%\)
\(n_{CuO}=\dfrac{1.6}{80}=0.02\left(mol\right)\)
\(CuO+H_2SO_4\rightarrow CuSO_4+H_2O\)
\(0.02.......0.02.................0.02\)
\(m_{H_2SO_4}=0.02\cdot98=1.96\left(g\right)\)
\(m_{dd_{H_2SO_4}}=\dfrac{1.96}{20\%}=9.8\left(g\right)\)
\(m_{\text{dung dịch sau phản ứng }}=1.6+9.8=11.4\left(g\right)\)
\(C\%_{CuSO_4}=\dfrac{0.02\cdot160}{11.4}=28.07\%\)