Hãy nhập câu hỏi của bạn vào đây, nếu là tài khoản VIP, bạn sẽ được ưu tiên trả lời.
\(n_{NaOH}=\dfrac{150.8\%}{40}=0,3\left(mol\right)\)
PTHH:
\(2NaOH+H_2SO_4\rightarrow Na_2SO_4+2H_2O\)
0,3 0,15 0,15 0,3
\(m_{HCl}=0,15.98=14,7\left(g\right)\)
\(m_{ddHCl}=\dfrac{14,7.100}{4,9}=300\left(g\right)\)
\(b,m_{Na_2SO_4}=0,15.142=21,3\left(g\right)\)
\(c,C\%_{Na_2SO_4}=\dfrac{21,3}{150+300}.100\%=4,733\%\)
Phần tính m dd axit bị nhầm thành thành HCl rồi em nhé, dẫn tới phần c cũng sai theo.
\(n_{Fe_2O_3}=\dfrac{8}{160}=0,05\left(mol\right)\)
PTHH: Fe2O3 + 3H2SO4 --> Fe2(SO4)3 + 3H2O
______0,05------>0,15--------->0,05
=> mH2SO4 = 0,15.98 = 14,7(g)
=> \(C\%\left(H_2SO_4\right)=\dfrac{14,7}{100}.100\%=14,7\%\)
\(C\%\left(Fe_2\left(SO_4\right)_3\right)=\dfrac{0,05.400}{8+100}.100\%=18,52\%\)
PTHH: Fe2(SO4)3 + 6NaOH --> 2Fe(OH)3\(\downarrow\) + 3Na2SO4
________0,05----------------------->0,1
=> mFe(OH)3 = 0,1.107=10,7(g)
\(2Al+3H_2SO_4 \to Al_2(SO_4)_3+3H_2\\ n_{Al}=0,4(mol)\\ a/\\ n_{H_2}=\frac{3}{2}.0,4=0,6(mol)\\ V_{H_2}=0,6.22,4=13,44(l)\\ b/\\ n_{H_2SO_4}=n_{H_2}=0,6(mol)\\ n_{ddH_2SO_4}=\frac{0,6.98.100}{20}=294(g)\\ c/\\ n_{Al_2(SO_4)_3}=0,2(mol)\\ C\%_{Al_2(SO_4)_3}=\frac{0,2.342}{10,8+294-0,6.2}.100\%=22,52\%\)
a) PTHH: CuO + H2SO4 → CuSO4 + H2O (1)
b) \(n_{CuO}=\dfrac{16}{80}=0,2\left(mol\right)\)
Theo PT1: \(n_{H_2SO_4}=n_{CuO}=0,2\left(mol\right)\)
\(\Rightarrow m_{H_2SO_4}=0,2\times98=19,6\left(g\right)\)
\(\Rightarrow C\%_{ddH_2SO_4}=\dfrac{19,6}{400}\times100\%=4,9\%\)
c) Theo PT1: \(n_{CuSO_4}=n_{CuO}=0,2\left(mol\right)\)
\(\Rightarrow m_{CuSO_4}=0,2\times160=32\left(g\right)\)
\(\Sigma m_{dd}=16+400=416\left(g\right)\)
\(\Rightarrow C\%_{ddCuSO_4}=\dfrac{32}{416}\times100\%=7,69\%\)
d) CuSO4 + BaCl2 → BaSO4↓ + CuCl2 (2)
Theo PT2: \(n_{BaSO_4}=n_{CuSO_4}=0,2\left(mol\right)\)
\(\Rightarrow m_{BaSO_4}=0,2\times233=46,6\left(g\right)\)
Vậy m=46,6
a) \(n_{CuO}=\dfrac{4}{80}=0,05\left(mol\right)\)
PTHH: CuO + 2HCl --> CuCl2 + H2O
0,05---->0,1----->0,05--->0,05
=> \(C\%\left(HCl\right)=\dfrac{0,1.36,5}{150}.100\%=2,433\%\)
b) \(C\%\left(CuCl_2\right)=\dfrac{0,05.135}{4+150}.100\%=4,383\%\)
a) PTHH: Zn + H2SO4 -> ZnSO4 + H2
nH2= 0,15(mol)
=> nZn=nH2SO4=nZnSO4=nH2=0,15(mol)
b) mZn=0,15.65=9,75(g)
c) CMddH2SO4= 0,15/ 0,05=3(M)
d) mZnSO4= 161. 0,15=24,15(g)
\(m_{ct}=\dfrac{20.98}{100}=19,6\left(g\right)\)
\(n_{H2SO4}=\dfrac{19,6}{98}=0,2\left(mol\right)\)
Pt : \(CuO+H_2SO_4\rightarrow CuSO_4+H_2O|\)
1 1 1 1
0,2 0,2 0,2
a) \(n_{CuO}=\dfrac{0,2.1}{1}=0,2\left(mol\right)\)
⇒ \(m_{CuO}=0,2.80=16\left(g\right)\)
b) \(n_{CuSO4}=\dfrac{0,2.1}{1}=0,2\left(mol\right)\)
⇒ \(m_{CuSO4}=0,2.160=32\left(g\right)\)
c) \(m_{ddspu}=16+98=114\left(g\right)\)
\(C_{CuSO4}=\dfrac{32.100}{114}=28,7\)0/0
Chúc bạn học tốt
