nZn=13/65=0,2(mol)

PTHH : Zn +2 HNO3 -> Zn(NO3)2 + H2O

nHNO3=nZn.2=0,2.2=0,4(mol)

=> VddHNO3=0,4/0,1=0,4(l)=400(ml)

=>CHỌN D

\(Zn+2HNO_3 \to Zn(NO_3)_2+H_2O\\ n_{Zn}=\frac{13}{65}=0,2(mol)\\ n_{HNO_3}=2.n_{Zn}=2.0,2=0,4 (mol)\\ V_{HNO_3}=\frac{0,4}{0,1}=4(l)=4000(ml)\)

\(n_{NaOH}=\dfrac{200\cdot4\%}{40}=0.2\left(mol\right)\)

\(2NaOH+H_2SO_4\rightarrow Na_2SO_4+H_2O\)

\(0.2..............0.1..............0.1\)

\(V_{dd_{H_2SO_4}}=\dfrac{0.1}{0.2}=0.5\left(l\right)\)

\(m_{Na_2SO_4}=0.1\cdot142=14.2\left(g\right)\)

\(m_{dd}=200+510=710\left(g\right)\)

\(C\%_{Na_2SO_4}=\dfrac{14.2}{710}\cdot100\%=2\%\)

Ta có: m_NaOH = 200.4% = 8 (g)

\(\Rightarrow n_{NaOH}=\dfrac{8}{40}=0,2\left(mol\right)\)

PT: \(2NaOH+H_2SO_4\rightarrow Na_2SO_4+2H_2O\)

_____0,2______0,1_______0,1 (mol)

a, \(V_{ddH_2SO_4}=\dfrac{0,1}{0,2}=0,5\left(l\right)\)

b, Chất có trong dd sau pư là Na₂SO₄.

Ta có: m _{dd sau pư} = m _{dd NaOH} + m _{dd H2SO4} = 200 + 510 = 710 (g)

\(\Rightarrow C\%_{Na_2SO_4}=\dfrac{0,1.142}{710}.100\%=2\%\)

Bạn tham khảo nhé!

\(m_{NaOH}=\dfrac{200.4}{100}=8\left(g\right)\\ n_{NaOH}=\dfrac{8}{40}=0,2\left(mol\right)\)

\(PTHH:2NaOH+H_2SO_4\rightarrow Na_2SO_4+2H_2O\)

a) \(n_{H_2SO_4}=\dfrac{1}{2}n_{NaOH}=\dfrac{1}{2}.0,2=0,1\left(mol\right)\)

\(V_{ddH_2SO_4}=\dfrac{n_{H_2SO_4}}{C_{M_{ddH_2SO_4}}}=\dfrac{0,1}{0,2}=0,5\left(l\right)=500\left(ml\right)\)

b) \(n_{Na_2SO_4}=n_{H_2SO_4}=0,1\left(mol\right)\)

\(m_{Na_2SO_4}=0,1.142=14,2\left(g\right)\)

\(m_{\text{dd sau pư}}=m_{ddNaOH}+m_{ddH_2SO_4}=200+510=710\left(g\right)\)

\(C\%_{Na_2SO_4}=\dfrac{m_{Na_2SO_4}}{m_{\text{dd sau pư}}}.100\%=\dfrac{14,2}{710}.100\%=2\%\)

a)Đổi \(V_{H_2SO_4}=100ml=0,1l\)

Số mol của 2,7 gam Al:

\(n_{Al}=\dfrac{m}{M}=\dfrac{2,7}{27}=0,1\left(mol\right)\)

PTHH: \(2Al+3H_2SO_4\rightarrow Al_2\left(SO_4\right)3+3H_2\)

Tỉ lệ     2      :  3          :      1           :         3

          0,1 ->  0,15       :      0,05     :         0,15(mol)

Nồng độ mol của dung dịch H2SO4:

\(C_{M_{H_2SO_4}}=\dfrac{n_{H_2SO_4}}{V_{H_2SO_4}}=\dfrac{0,15}{0,1}=1,5\left(M\right)\)

b) thể tích của 0,15 mol H2:

\(V_{H_2}=n.22,4=0,15.22,4=3,36\left(l\right)\)

c) nồng độ mol của dd \(Al_2\left(SO_4\right)_3\) :

\(C_{M_{Al_2\left(SO_4\right)_3}}=\dfrac{n}{V}=\dfrac{0,05}{0,1}=0,5\left(M\right)\)

giúp mik với ạ

ai giúp mik với ạ

\(a.H_2SO_{\text{4}}+2NaOH\rightarrow Na_2SO_4+2H_2O\left(1\right)\\ H_2SO_4+Fe\rightarrow FeSO_4+H_2\left(2\right)\\ n_{Fe}=\dfrac{19,04}{56}=0,34\left(mol\right)\\ n_{H_2}=n_{Fe}=0,34\left(mol\right)\\ \Rightarrow V_{H_2}=0,34.22,4=7,616\left(mol\right)\\ b.n_{H_2SO_4\left(2\right)}=n_{Fe}=0,34\left(mol\right)\\ n_{H_2SO_4\left(bđ\right)}=0,5.1=0,5\left(mol\right)\\ \Rightarrow n_{H_2SO_4\left(1\right)}=0,5-0,34=0,16\left(mol\right)\\ Tacó:n_{NaOH}=2n_{H_2SO_4 }=0,32\left(mol\right)\\ \Rightarrow V_{NaOH}=\dfrac{0,32}{0,5}=0,64\left(l\right)\)

a) 2Al + 3H₂SO₄ --> Al₂(SO₄)₃ + 3H₂

b) \(n_{Al}=\dfrac{10,8}{27}=0,4\left(mol\right)\)

PTHH: 2Al + 3H₂SO₄ --> Al₂(SO₄)₃ + 3H₂

             0,4--->0,6-------------------->0,6

=> V_H2 = 0,6.22,4 = 13,44 (l)

c) \(V_{dd.H_2SO_4}=\dfrac{0,6}{1}=0,6\left(l\right)\)

d) \(n_{Fe_2O_3}=\dfrac{16}{160}=0,1\left(mol\right)\)

PTHH: Fe₂O₃ + 3H₂ --t^o--> 2Fe + 3H₂O

Xét tỉ lệ: \(\dfrac{0,1}{1}< \dfrac{0,6}{3}\) => Fe₂O₃ hết, H₂ dư

PTHH: Fe₂O₃ + 3H₂ --t^o--> 2Fe + 3H₂O

               0,1----------------->0,2

=> m_Fe = 0,2.56 = 11,2 (g)

\(n_{FeO}=\dfrac{10.8}{72}=0.15\left(mol\right)\)

\(FeO+2HCl\rightarrow FeCl_2+H_2O\)

\(0.15.......0.3.............0.15\)

\(m_{HCl}=0.3\cdot36.5=10.95\left(g\right)\)

\(C\%HCl=\dfrac{10.95}{100}\cdot100\%=10.95\%\)

\(m_{dd}=10.8+100=110.8\left(g\right)\)

\(m_{FeCl_2}=0.15\cdot127=19.05\left(g\right)\)

\(C\%FeCl_2=\dfrac{19.05}{110.8}\cdot100\%=17.19\%\)

C%HCl=10.95100⋅100%=10.95%C%HCl=10.95100⋅100%=10.95%

mdd=10.8+100=110.8(g)mdd=10.8+100=110.8(g)

mFeCl2=0.15⋅127=19.05(g)mFeCl2=0.15⋅127=19.05(g)