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\(a.2KClO_3\xrightarrow[t^0]{xt}2KCl+3O_2\\ b.n_{KClO_3}=\dfrac{m_{KClO_3}}{M_{KClO_3}}=\dfrac{22,05}{122,5}=0,18mol\\ n_{O_2\left(lt\right)}=\dfrac{0,18.3}{2}=0,27mol\\ V_{O_2\left(lt\right)}=n_{O_2\left(lt\right)}.22,4=0,27.22,4=6,048l\\ H=\dfrac{V_{O_2\left(tt\right)}}{V_{O_2\left(lt\right)}}\cdot100\%=\dfrac{3,36}{6,048}\cdot100\%\approx55,56\%\\ c.n_{O_2}=\dfrac{V_{O_2}}{22,4}=\dfrac{3,36}{22,4}=0,15mol\\ n_{KCl}=\dfrac{0,15.2}{3}=0,1mol\\ m_{KCl}=n_{KCl}.M_{KCl}=0,1.74,5=7,45g\)
\(a,PTHH:2KClO_3\xrightarrow{t^o}2KCl+3O_2\\ b,n_{KClO_3(thực tế)}=\dfrac{36,75}{122,5}=0,3(mol)\\ n_{O_2(phản ứng)}=\dfrac{6,72}{22,4}=0,3(mol)\\ \Rightarrow n_{KClO_3(phản ứng)}=\dfrac{2}{3}n_{O_2}=0,2(mol)\\ \Rightarrow H\%=\dfrac{0,2}{0,3}.100\%=66,67\%\\ c,n_{KCl}=n_{KClO_3(phản ứng)}=0,2(mol)\\ \Rightarrow m_{KCl}=0,2.74,5=14,9(g)\)
\(2KClO_3\rightarrow3O_2+2KCl\)
\(m_{KClO_3}=m_{O_2}+m_{KCl}\)
\(\Rightarrow m_{KCl}=m_{KClO_3}-m_{KCl}=24,5-9,6=14,9\left(g\right)\)
a)PTHH:\(2KCLO_3\rightarrow^{t^o}2KCL+3O_2\)
b)\(n_{KCL}=\frac{2,98}{74,5}=0,4mol\)
Từ phương trình hóa học\(n_{KCL}=n_{KCLO_3}=0,04mol\)
\(n_{KCLO_3}=0,04\cdot122,5=4,9g\)
\(H=\frac{4,9}{9,8}\cdot100\%=50\%\)
a. PTHH: \(2KClO_3\rightarrow^{t^o}2KCl+3O_2\)
b. \(n_{KCl}=\frac{2,98}{74,5}=0,4mol\)
Từ phương trình hoá học \(n_{KCl}=n_{KClO_3}=0,04mol\)
\(n_{KClO_3}=0,04.122,5=4,9g\)
\(H=\frac{4,9}{9,8}.100\%=50\%\)
a) PTHH: 2 KClO3 -to-> 2 KCl + 3 O2
nKCl= 14,9/74,5= 0,2(mol)
b) nKClO3=nKCl=0,2(mol)
=>mKClO3=0,2.122,5=24,5(g)
c) nO2=3/2. 0,2=0,3(mol)
=>V(O2,đktc)=0,3.22,4=6,72(l)
a, \(Fe_2O_3+3H_2\underrightarrow{t^o}2Fe+3H_2O\)
b, \(n_{Fe}=\dfrac{11,2}{56}=0,2\left(mol\right)\)
Theo PT: \(n_{Fe_2O_3}=\dfrac{1}{2}n_{Fe}=0,1\left(mol\right)\Rightarrow m_{Fe_2O_3}=0,1.160=16\left(g\right)\)
c, Theo PT: \(n_{H_2}=\dfrac{3}{2}n_{Fe}=0,3\left(mol\right)\)
\(\Rightarrow V_{H_2}=0,3.22,4=6,72\left(l\right)\)
1. a. \(PTHH:2Mg+O_2\overset{t^o}{--->}2MgO\left(1\right)\)
b. Ta có: \(n_{Mg}=\dfrac{24}{24}=1\left(mol\right)\)
Theo PT(1): \(n_{O_2}=\dfrac{1}{2}.n_{Mg}=\dfrac{1}{2}.0,1=0,5\left(mol\right)\)
\(\Rightarrow V_{O_2}=0,5.22,4=11,2\left(lít\right)\)
c. \(PTHH:2KClO_3\xrightarrow[t^o]{MnO_2}2KCl+3O_2\left(2\right)\)
Theo PT(2): \(n_{KClO_3}=\dfrac{2}{3}.n_{O_2}=\dfrac{2}{3}.0,5=\dfrac{1}{3}\left(mol\right)\)
\(\Rightarrow m_{KClO_3}=\dfrac{1}{3}.122,5=40,83\left(g\right)\)
2. \(PTHH:3Fe+2O_2\overset{t^o}{--->}Fe_3O_4\)
Ta có: \(n_{Fe_3O_4}=\dfrac{2,32}{232}=0,01\left(mol\right)\)
a. Theo PT: \(n_{Fe}=3.n_{Fe_3O_4}=0,01.3=0,03\left(mol\right)\)
\(\Rightarrow m_{Fe}=0,03.56=1,68\left(g\right)\)
b. Theo PT: \(n_{O_2}=2.n_{Fe_3O_4}=2.0,01=0,02\left(mol\right)\)
\(\Rightarrow V_{O_2}=0,02.22,4=0,448\left(lít\right)\)
`#3107.101107`
1.
a.
Ta có:
\(\text{n}_{\text{KClO}_3}=\dfrac{\text{m}_{\text{KClO}_3}}{\text{M}_{\text{KClO}_3}}=\dfrac{122,5}{122,5}=1\text{ (mol)}\)
PTPỨ: \(\text{2KClO}_3\text{ }\)\(\underrightarrow{\text{ }t^0}\) \(\text{2KCl}+3\text{O}_2\)
Ta có: `2` mol \(\text{KClO}_3\) thu được `3` mol \(\text{O}_2\)
`=>` `1` mol \(\text{KClO}_3\) thu được `1,5` mol \(\text{O}_2\)
b.
\(\text{V}_{\text{O}_2}=\text{n}_{\text{O}_2}\cdot24,79=1,5\cdot24,79=37,185\left(l\right)\)
TTĐ:
\(m_{KClO_3}=122,5\left(g\right)\)
______________
a) PTHH?
b) \(V_{O_2}=?\left(l\right)\)
Giải
\(n_{KClO_3}=\dfrac{m}{M}=\dfrac{122,5}{122,5}=1\left(mol\right)\)
\(2KClO_3\underrightarrow{t^o}2KCl+3O_2\uparrow\)
1-> 1 : 1,5(mol)
\(V_{O_2}=n.22,4=1,5.22,4=33,6\left(l\right)\)
2KClO3 ---> 2KCl +3O2
nKClo3 = 24,5/122,5 = 0,2 mol
nKCl = nKClo3 =0,2 mol
m Kcl = 0,2 x 74,5 = 14,9g
no2 = 0,2x3:2 = 0,3mol
Vo2 = n.22,4 = 6,72 lít
mik làm ròi nhé
cho mk xin đc ko ạ
cảm ơn nhìu nha