Hãy nhập câu hỏi của bạn vào đây, nếu là tài khoản VIP, bạn sẽ được ưu tiên trả lời.
a/ PTHH: 2 KClO3 -to-> 2 KCl + 3 O2
nKCl= 29,8/74,5=0,4(mol)
nKClO3= nKCl=0,4(mol)
=>mKClO3= 0,4.122,5= 49(g)
b) nO2= 3/2. 0,4=0,6(mol)
=> V(O2,đktc)=0,6.22,4=13,44(l)
= 
a.\(n_{KClO_3}=\dfrac{m_{KClO_3}}{M_{KClO_3}}=\dfrac{12,25}{122,5}=0,1mol\)
\(2KClO_3\rightarrow\left(t^o\right)2KCl+3O_2\)
2 2 3 ( mol )
0,1 0,15
\(V_{O_2}=n_{O_2}.22,4=0,15.22,4=3,36l\)
b.\(V_{kk}=V_{O_2}.5=3,36.5=16,8l\)
c.\(n_{Fe}=\dfrac{m_{Fe}}{M_{Fe}}=\dfrac{28}{56}=0,5mol\)
\(3Fe+2O_2\rightarrow\left(t^o\right)Fe_3O_4\)
3 2 1 ( mol )
0,5 > 0,15 ( mol )
0,225 0,15 ( mol )
\(m_{Fe\left(du\right)}=n_{Fe\left(du\right)}.M_{Fe}=\left(0,5-0,225\right).56=15,4g\)
\(n_{O_2}=\dfrac{43.2}{32}=1.35\left(mol\right)\)
\(2KClO_3\underrightarrow{^{t^0}}2KCl+3O_2\)
\(0.9...........................1.35\)
\(H\%=\dfrac{0.9}{1}\cdot100\%=90\%\)
PT: \(2KClO_3\underrightarrow{t^o}2KCl+3O_2\)
______1_____________1,5 (mol)
⇒ mO2 (lí thuyết) = 1,5.32 = 48 (g)
Mà: mO2 (thực tế) = 43,2 (g)
\(\Rightarrow H\%=\dfrac{43,2}{48}.100\%=90\%\)
Bạn tham khảo nhé!
a) $2KClO_3 \xrightarrow{t^o} 2KCl + 3O_2$
$n_{KClO_3} = \dfrac{36,75}{122,5} = 0,3(mol)$
Theo PTHH : $n_{O_2} = \dfrac{3}{2}n_{KClO_3} = 0,45(mol)$
$\Rightarrow V_{O_2} = 0,45.22,4 = 10,08(lít)$
b) Số phân tử $KCl = 0,45.6.10^{23} = 2,7.10^{23}$ phân tử
c) $2Mg + O_2 \xrightarrow{t^o} 2MgO$
Theo PTHH : $n_{MgO} = 2n_{O_2} = 0,9(mol)$
$m_{MgO} = 0,9.40 = 36(gam)$
\(a.2KClO_3-^{t^o}\rightarrow2KCl+3O_2\\ n_{O_2}=\dfrac{3}{2}n_{KClO_3}=0,6\left(mol\right)\\ \Rightarrow V_{O_2}=0,6.22,4=13,44\left(l\right)\\ n_{KCl}=n_{KClO_3}=0,4\left(mol\right)\\ \Rightarrow m_{KCl}=0,4.74,5=29,8\left(g\right)\)
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
\(2KClO_3\rightarrow3O_2+2KCl\)
\(m_{KClO_3}=m_{O_2}+m_{KCl}\)
\(\Rightarrow m_{KCl}=m_{KClO_3}-m_{KCl}=24,5-9,6=14,9\left(g\right)\)
\(n_{KClO_3}=\dfrac{12,25}{122,5}=0,1mol\)
\(2KClO_3\rightarrow\left(t^o,MnO_2\right)2KCl+3O_2\)
0,1 0,1 0,15 ( mol )
\(m_{KCl}=0,1.74,5=7,45g\)
\(V_{O_2}=0,15.22,4=3,36l\)
nKClO3=0,1(mol)
PTHH: 2 KClO3 -to-> 2 KCl +3 O2
0,1_____________0,1______0,15(mol)
a) mKCl=0,1.74,5=7,45(g)
b) V(O2,đktc)=0,15.22,4=3,36(l)
\(n_{KClO_3}=\dfrac{12,25}{122,5}=0,1\left(mol\right)\)
PTHH: \(2KClO_3\rightarrow2KCl+3O_2\)
0,1 0,1 0,15 (mol)
\(m_{KCl}=0,1.74,5=7,45\left(g\right)\)
\(V_{O_2}=0,15.22,4=3,36\left(l\right)\)