Hãy nhập câu hỏi của bạn vào đây, nếu là tài khoản VIP, bạn sẽ được ưu tiên trả lời.
\(a) 2KClO_3 \xrightarrow{t^o,MnO_2} 2KCl +3 O_2\\ n_{O_2} = \dfrac{3}{2}n_{KClO_3} = \dfrac{3}{2}. \dfrac{9,8}{122,5} = 0,12(mol)\\ \Rightarrow V_{O_2} = 0,12.22,4 = 2,688(lít)\\ b) 2H_2O \xrightarrow{điện\ phân} 2H_2 + O_2\\ n_{O_2} = \dfrac{1}{2}n_{H_2O} = \dfrac{1}{2}. \dfrac{36.1000}{18} = 1000(mol)\\ \Rightarrow V_{O_2} = 1000.22,4 = 22400(lít)\)
\(â.\)
\(n_{KClO_3}=\dfrac{9.8}{122.5}=0.08\left(mol\right)\)
\(2KClO_3\underrightarrow{t^0}2KCl+3O_2\)
\(0.08........................0.12\)
\(V_{O_2}=0.12\cdot22.4=2.688\left(l\right)\)
\(b.\)
\(n_{H_2O}=\dfrac{36\cdot1000}{18}=2000\left(mol\right)\)
\(2H_2O\underrightarrow{t^0}2H_2+O_2\)
\(2000..................1000\)
\(V_{O_2}=1000\cdot22.4=22400\left(l\right)\)
= 
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 )
\(m_{Fe\left(du\right)}=n_{Fe\left(du\right)}.M_{Fe}=\left(0,5-0,225\right).56=15,4g\)
a) \(2KClO_3\xrightarrow[MnO_2]{t^o}2KCl+3O_2\)
\(n_{KClO_3}=\dfrac{m}{M}=\dfrac{9,8}{122,5}=0,08\left(mol\right)\)
Theo PTHH, \(n_{O_2}=\dfrac{3}{2}n_{KClO_3}=\dfrac{3}{2}\cdot0,08=0,12\)(mol)
\(V_{O_2}=n\cdot22,4=0,12\cdot22,4=2,688\left(l\right)\)
b) \(2H_2O\overrightarrow{đp}2H_2+O_2\)
Đổi: \(36kg=36000g\)
\(n_{H_2O}=\dfrac{m}{M}=\dfrac{36000}{18}=2000\left(mol\right)\)
Theo PTHH, \(n_{O_2}=\dfrac{1}{2}n_{H_2O}=\dfrac{1}{2}\cdot2000=1000\left(mol\right)\)
\(V_{O_2}=n\cdot22,4=1000\cdot22,4=22400\left(l\right)\)
\(n_{KClO_3}=\dfrac{12,25}{122,5}=0,1mol\)
\(2KClO_3\rightarrow\left(t^o,MnO_2\right)2KCl+3O_2\)
0,1 0,1 0,15 ( mol )
\(m_{KCl}=0,1.74,5=7,45g\)
\(V_{O_2}=0,15.22,4=3,36l\)
2KClO3-to>2KCl+3O2
0,3---------------------0,45 mol
nKClO3= \(\dfrac{36,75}{122,5}\)=0,3 mol
=>VO2=0,45.22,4=10,08l
=>D
\(n_{KClO_3}=\dfrac{36,75}{122,5}=0,3\left(mol\right)\\ 2KClO_3\rightarrow\left(t^o,xt\right)2KCl+3O_2\\ n_{O_2}=\dfrac{3}{2}.0,3=0,45\left(mol\right)\\ \Rightarrow V_{O_2\left(đktc\right)}=0,45.22,4=10,08\left(l\right)\\ \Rightarrow ChọnD\)
Xíu check in sân bay, chừ làm vài câu đã háy :P
\(2KClO_3\rightarrow3O_2+2KCl\)
\(m_{KClO_3}=m_{O_2}+m_{KCl}\)
\(\Rightarrow m_{KCl}=m_{KClO_3}-m_{KCl}=24,5-9,6=14,9\left(g\right)\)
nKClO3 = 4,9/122,5 = 0,04 (mol)
PTHH: 2KClO3 -> (t°, MnO2) 2KCl + 3O2
Mol: 0,04 ---> 0,04 ---> 0,06
mKCl = 0,04 . 74,5 = 2,98 (g)
VO2 = 0,06 . 22,4 = 1,344 (l)
4Na + O2 -> (t°) 2Na2O
0,24 <--- 0,06
mNa = 0,24 . 23 = 5,52 (g)
a) \(2KClO_3 \xrightarrow{t^o} 2KCl + 3O_2\)
b)
\(n_{KClO_3} = \dfrac{36,75}{122,5} = 0,3(mol)\)
Theo PTHH :
\(n_{KCl} = n_{KClO_3} = 0,3(mol)\\ \Rightarrow m_{KCl} = 0,3.74,5 = 22,35(gam)\\ \Rightarrow m_{O_2} = m_{KClO_3} - m_{KCl} = 14,4(gam)\)
c)
Bảo toàn khối lượng :
\(m_{O_2} = 25 - 15,4 = 9,6(gam)\\ \Rightarrow n_{O_2} = \dfrac{9,6}{32} = 0,3(mol)\\ n_{KClO_3} = \dfrac{2}{3}n_{O_2} = 0,2(mol)\\ \Rightarrow m_{KClO_3} = 0,2.122,5 = 24,5(gam)\\ \%m_{tạp\ chất}= \dfrac{25-24,5}{25}.100\% = 2\%\)
\(a.\)
\(2KClO_3\underrightarrow{t^0}2KCl+3O_2\)
\(b.\)
\(n_{KClO_3}=\dfrac{36.75}{122.5}=0.3\left(mol\right)\)
\(\Rightarrow n_{O_2}=\dfrac{3}{2}n_{KClO_3}=\dfrac{3}{2}\cdot0.3=0.45\left(mol\right)\)
\(m_{O_2}=0.45\cdot32=14.4\left(g\right)\)
\(m_{KCl}=0.3\cdot74.5=22.35\left(g\right)\)
\(c.\)
\(2KClO_3\underrightarrow{t^0}2KCl+3O_2\)
\(a.............a\)
\(m_{Cr}=m_{KCl}+m_{tc}=25-122.5a+74.5a=15.4\left(g\right)\)
\(\Rightarrow a=0.2\)
\(m_{O_2}=\dfrac{3}{2}\cdot0.2\cdot32=9.6\left(g\right)\)
\(m_{KClO_3}=0.2\cdot122.5=24.5\left(g\right)\)
\(m_{tc}=25-24.5=0.5\left(g\right)\)
\(\%m_{Tc}=\dfrac{0.5}{25}\cdot100\%-2\%\)
a) n KClO3=9,8/122,5=0,08(mol)
2KClO3--->2KCl+3O2
0,08----------------->0,12(mol)
V O2=0,12.22,4=2,688(l)
b)ông ngiệp là gì nhỉ ?
Mk viết nhầm nha!!!
ý b, Khi điện phân 36 kg \(H_2O\) trong công nghiệp