Thật lun ?

thật mà !

a) \(n_{Fe}=\dfrac{11,2}{56}=0,2\left(mol\right)\)

PTHH: Fe + 2HCl --> FeCl₂ + H₂

_____0,2--->0,4---->0,2----->0,2

=> V_H2 = 0,2.22,4 = 4,48 (l)

b) m_HCl = 0,4.36,5 =14,6 (g)

c) m_FeCl2 = 0,2.127 = 25,4 (g)

\(n_{Fe}=\dfrac{11.2}{56}=0.2\left(mol\right)\)

\(Fe+2HCl\rightarrow FeCl_2+H_2\)

\(0.2......0.4..........0.2...........0.2\)

\(V_{H_2}=0.2\cdot22.4=4.48\left(l\right)\)

\(m_{HCl}=0.4\cdot36.5=14.6\left(g\right)\)

\(m_{FeCl_2}=0.2\cdot127=25.4\left(g\right)\)

\(PTPU:Fe+2HCl\rightarrow FeCl_2+H_2\)

\(a.n_{Fe}=\dfrac{11,2}{56}=0,2\left(mol\right)\)

\(\Rightarrow V_{Fe}=0,2.22,4=4,48\left(l\right)\)

\(b.\) ta có: \(n_{HCl}=2\)

\(\Rightarrow n_{Fe}=0,2.2=0,4\left(mol\right)\)

\(\Rightarrow m_{HCl}=0,4.36,5=14,6\left(g\right)\)

\(c.n_{FeCl_2}=n_{Fe}=0,2mol\)

\(\Rightarrow m_{FeCl_2}=0,2.127=25,4\left(g\right)\)

Câu 1:

\(n_{Fe}=\dfrac{11,2}{56}=0,2(mol)\\ Fe+2HCl\to FeCl_2+H_2\\ \Rightarrow n_{H_2}=n_{FeCl_2}=0,2(mol);n_{HCl}=0,4(mol)\\ a,V_{H_2}=0,2.22,4=4,48(l)\\ b,m_{HCl}=0,4.36,5=14,6(g)\\ c,m_{FeCl_2}=0,2.127=25,4(g)\)

Câu 2:

\(n_{Fe}=\dfrac{1,4}{56}=0,025(mol)\)

Theo PT bài 1: \(n_{HCl}=0,05(mol);n_{H_2}=0,025(mol)\\ a,m_{HCl}=0,05.36,5=1,825(g)\\ b,V_{H_2}=0,025.22,4=0,56(l)\)

Câu 3:

\(4Al+3O_2\xrightarrow{t^o}2Al_2O_3\\ n_{Al}=\dfrac{2,4.10^{22}}{6.10^{23}}=0,04(mol)\\ \Rightarrow n_{O_2}=0,03(mol);n_{Al_2O_3}=0,02(mol)\\ a,V_{O_2}=0,03.22,4=0,672(l)\Rightarrow V_{kk}=0,672.5=3,36(l)\\ b,m_{Al_2O_3}=0,02.102=2,04(g)\)

Câu 4:

\(S+O_2\xrightarrow{t^o}SO_2\\ a,ĐC:S,O_2\\ HC:SO_2\\ b,n_{O_2}=1,5(mol)\\ \Rightarrow V{O_2}=1,5.22,4=33,6(l)\\ c,d_{S/kk}=\dfrac{32}{29}>1\)

Vậy S nặng > kk

\(n_{Fe_2o_3}=\dfrac{36}{160}=0,2\left(m\right)\)

\(PTHH:Fe_2O_3+3H_2\xrightarrow[]{}2Fe+3H_2O\)

tỉ lệ          :1             3           2         3

số mol     :0,2          0,6        0,4       0,6

\(m_{Fe}=0,4.56=22,4\left(g\right)\)

b)\(V_{H_2}=0,6.22,4=13,44\left(l\right)\)

a. Ý nghĩa:

Hiệu điện thế định mức của bóng đèn là 12V.

Công suất định mức của bóng đèn là 6W.

b. \(I=\dfrac{P}{U}=\dfrac{6}{12}=0,5\left(A\right)\)

c. \(R=\dfrac{U}{I}=\dfrac{12}{0,5}=24\left(\Omega\right)\)

d. \(A=Pt=6.1=6\left(Wh\right)=21600\left(J\right)\)

\(PTHH:Fe+2HCl\rightarrow FeCl_2+H_2\)

________0,2____0,4______ 0,2_____0,2

a, Ta có:

\(n_{Fe}=\frac{11,2}{56}=0,2\left(mol\right)\)

\(\Rightarrow V_{H2}=0,2.22,4=4,48\left(l\right)\)

b,

\(m_{HCl}=0,4.\left(1+35,5\right)=14,6\left(g\right)\)

c,

\(m_{FeCl2}=0,2.\left(56+35,5.2\right)=25,4\left(g\right)\)

Fe+2HCl---------> FeCl2 + H2

\(n_{Fe}=\frac{11,2}{56}=0,2\left(mol\right)\)

a) Theo PT: \(n_{H_2}=n_{Fe}=0,2\left(mol\right)\)

=> V _H2 = 0,2. 22,4 = 4,48(l)

b) Theo PT: \(n_{HCl}=2n_{Fe}=0,4\left(mol\right)\)

=> m _HCl = 0,4. 36,5 = 14,6 (g)

c) Theo PT: \(n_{FeCl_2}=n_{Fe}=0,2\left(mol\right)\)

=> m _FeCl2 = 0,2. 127 = 25,4 (g)

\(Fe+2HCl-->FeCl_2+H_2\)

0,2___0,4__________0,2____0,2

\(n_{Fe}=\dfrac{11,2}{56}=0,2\left(mol\right)\)

a) => \(V_{H_2}=0,2.22,4=4,48\left(l\right)\)

b)=> \(m_{HCl}=0,4.36,5=14,6\left(g\right)\)

c) \(m_{FeCl_2}=0,2.127=25,4\left(g\right)\)

Fe + 2HCl → FeCl₂ + H₂

\(n_{Fe}=\dfrac{11,2}{56}=0,2\left(mol\right)\)

a) Theo PT: \(n_{H_2}=n_{Fe}=0,2\left(mol\right)\)

\(\Rightarrow V_{H_2}=0,2\times22,4=4,48\left(l\right)\)

b) Theo PT: \(n_{HCl}=2n_{Fe}=2\times0,2=0,4\left(mol\right)\)

\(\Rightarrow m_{HCl}=0,4\times36,5=14,6\left(g\right)\)

c) Theo PT: \(n_{FeCl_2}=n_{Fe}=0,2\left(mol\right)\)

\(\Rightarrow m_{FeCl_2}=0,2\times127=25,4\left(g\right)\)

nFe= 11.2/56=0.2 (mol)

Fe +2HCl --> FeCl2 + H2

Từ PTHH :

mFeCl2= 0.2*127=25.4g

mH2= 0.2*2=0.4g

mHCl= 0.4*36.5=14.6g

mdd sau phản ứng= 11.2+120-0.4=130.8g

C%FeCl2= 25.4/130.8*100= 19.42%

C%HCl= 14.6/120*100= 12.17%