a/Vo2=5,6l

b/mkclo3=20,4

Bạn làm lời giải chi tiết giúp mk nhé

Cảm ơn bạn ạ

Bạn làm như thế mình ko hiểu ạ

2Zn+O2--->2ZnO

a) n Zn=40,5/81=0,5(mol)

Theo pthh

n O2=1/2 n ZnO=0,25(mol)

V O2=0,25.22,4=5,6(l)

b) 2KClO3--->2KCl+3O2

Theo pthh

n KClO3=2/3n O2=0,16667(mol)

m KClO3=0,16667.122,5=20,42(g)

Chúc bạn học tốt

a, PTHH ( I ) : \(2Zn+O_2\rightarrow2ZnO\)

\(n_{ZnO}=\frac{m_{ZnO}}{M_{ZnO}}=\frac{40,5}{65+16}=0,5\left(mol\right)\)

- Theo PTHH ( I ) : \(n_{O_2}=\frac{1}{2}n_{ZnO}=\frac{1}{2}0,5=0,25\left(mol\right)\)

-> \(V_{O_2}=n_{O_2}.22,4=0,25.22,4=5,6\left(l\right)\)

b, PTHH ( II ) : \(2KClO_3\rightarrow2KCl+3O_2\)

- Theo PTHH ( II ) : \(n_{KClO_3}=\frac{2}{3}n_{O_2}=\frac{2}{3}0,25=\frac{1}{6}\left(mol\right)\)

-> \(m_{KClO_3}=n_{KClO_3}.M_{KClO_3}=\frac{1}{6}.122,5\approx20,4\left(g\right)\)

a) \(2Zn+O_2\rightarrow^{t^o}2ZnO\)

\(n_{ZnO}=\frac{40,5}{81}=0,5mol\)

Theo phương trình thì \(n_{O_2}=\frac{1}{2}n_{ZnO}=\frac{1}{2}.0,5=0,25mol\)

\(\Rightarrow V_{O_2}=0,25.22,4=5,6l\)

b)\(2KClO_3\underrightarrow{t^o}2KCl+3O_2\)

Theo phương trình thì \(n_{KClO_3}=\frac{2}{3}n_{O_2}=\frac{2}{3}.0,25=\frac{1}{6}mol\)

\(\Rightarrow m_{KClO_3}=\frac{1}{6}.122,5=24,42g\)

nZnO=40,5/81=0,5(mol)

PTHH: 2Zn+O2-> 2ZnO

                    0,25    0,5  (mol)

VO2= 0,25.22,4=5,6(l)

2Zn + O₂ --> 2ZnO

0,06 <-- 0,03 <----0,06 (mol)

n_ZnO = \(\dfrac{4,86}{81}\)= 0,06 (mol)

m_Zn = 0,06 . 65 = 3,9 (g)

VO2 = 0,03 . 22,4 = 0,672 (l)

2KClO₃ ----> 2KCl + 3O₂

0,02 <------------------- 0,03 (mol)

m_KClO3 = 0,02 . (39 + 35,5 + 16.3)

                = 2,45 (g)

Kiểm tra lại dùm, thank you

a,PTHH: 2Zn+O2−to−>2ZnO2Zn+O2−to−>2ZnO

Bảo toàn khối lượng

⇒mZn=mZnO−mO2=32,4−6,4=26(g)

b,

 Ta có: n_Zn = 6,565=0,1(mol)6,565=0,1(mol)

Theo phương trình, n_O2 = 0,12=0,05(mol)0,12=0,05(mol)

=> Thể tích khí Oxi: V_O2(đktc) = 0,05 x 22,4 = 1,12 (l)

c,

PTHH:2KClO3to→2KCl+3O2PTHH:2KClO3to→2KCl+3O2

nO2=VO222,4=5,0422,4=0,225(mol)nO2=VO222,4=5,0422,4=0,225(mol)

TheoTheo PTHH,PTHH, tacó:tacó:

nKClO3=23nO2=23.0,225=0,15(mol)nKClO3=23nO2=23.0,225=0,15(mol)

mKClO3=nKClO3.MKClO3=0,15.122,5=18,375(g)mKClO3=nKClO3.MKClO3=0,15.122,5=18,375(g)

Vậy ...

Ko b đúng ko nữa.

\(pthh:2Zn+O_2\overset{t^0}{\rightarrow}2ZnO\left(1\right)\)

\(n_{ZnO}=\dfrac{m}{M}=\dfrac{40,5}{81}0,5\left(mol\right)\)

Theo \(pthh\left(1\right):n_{O_2}=\dfrac{1}{2}n_{ZnO}=\dfrac{1}{2}\cdot0,5=0,25\left(mol\right)\)

\(\Rightarrow m_{O_2}=n\cdot M=0,25\cdot32=8\left(g\right)\)

\(2KClO_3\overset{t^0}{\rightarrow}2KCl+3O_2\left(2\right)\)

Theo \(pthh\left(2\right):n_{KClO_3}=\dfrac{2}{3}n_{O_2}=\dfrac{2}{3}\cdot0,25=\dfrac{1}{3}\left(mol\right)\)

\(\Rightarrow m_{KClO_3}=n\cdot M=\dfrac{1}{3}\cdot122,5=40,83\left(g\right)\)

a,\(2Zn+O_2\rightarrow2ZnO\)

\(n_{ZnO}=\frac{81}{81}=1\left(mol\right)\)

\(n_{O2}=\frac{1}{2}n_{ZnO}=\frac{1}{2}n_{Zn}=0,5\left(mol\right)\)

\(\Rightarrow m_{Zn}=1.65=65\left(g\right)\)

\(m_{O2}=0,5.32=16\left(g\right)\)

b,\(2KClO_3\rightarrow2KCl+3O_2\)

\(n_{O2}=\frac{1}{80}.100=1,25\left(mol\right)\)

\(n_{KClO3}=0,83\left(mol\right)\)

\(\Rightarrow m_{KClO3}=0,83.122,5=102,083\left(g\right)\)

Câu a của bạn dưới đúng, câu b em xem nhé!

b) PTHH: 2 KClO3 -to-> 2 KCl + 3 O2

1/3______________________0,5(mol)

Vì : H= 80% => nKClO3(TT)= 1/3 : 80%=5/12(mol)

=> \(mKClO3\left(TT\right)=\frac{5}{12}.122,5\approx51,042\left(g\right)\)

2Zn+O2-to>2ZnO

7\130--7\260

n Zn=\(\dfrac{7}{130}mol\)

=>VO2=\(\dfrac{7}{260}22,4\)=0,6l

b)

2KClO3-to>2KCl+3O2

=>7\390---------------7\260

=>m KClO3=\(\dfrac{7}{390}\).122,5=2,198g

\(n_{Zn}=\dfrac{3,5}{65}=\dfrac{7}{130}mol\)

\(2Zn+O_2\underrightarrow{t^o}2ZnO\)

\(\dfrac{7}{130}\)    \(\dfrac{7}{260}\)

\(V_{O_2}=\dfrac{7}{360}\cdot22,4=0,6l\)

\(2KClO_3\underrightarrow{t^o}2KCl+3O_2\)

\(\dfrac{7}{390}\)                         \(\dfrac{7}{260}\)

\(m_{KClO_3}=\dfrac{7}{390}\cdot122,5=2,2g\)

3,25 g Zn chứ bạn, bạn check lại đề ik :)