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a) \(2KClO3\xrightarrow[MnO_2]{t^o}2KCl+3O_2\)
b) \(n_{KCl}=n_{KClO_3}=0,1\left(mol\right)\)
\(m_{KCl}=0,1.74,5=7,45\left(g\right)\)
c) \(n_{O_2}=\dfrac{4,48}{22,4}=0,2\left(mol\right)\)
\(n_{KClO_3}=\dfrac{2}{3}.0,2=0,13\left(mol\right)\)
\(m_{KClO_3}=0,13.122,5=15,925\left(g\right)\)
d) \(n_{O_2}=\dfrac{3}{2}.1,5=2,25\left(mol\right)\)
\(m_{O_2}=2,25.32=72\left(g\right)\)
a) 2KClO3 -> 2KCl + 3O2 (1)
b) 0,1.........->0,1
=> nếu có 0,1 mol KClO3 pứ sẽ thu được 0,1 mol KCl
c) nO2 = \(\dfrac{4,48}{22,4}\) = 0,2 mol
theo pt (1) nKClO3 = \(\dfrac{2}{3}\)nO2 = 0,13 mol
=>mKClO3 = 0,13 . 122,5 = 15,925 g
d) nO2 = \(\dfrac{3}{2}\)nKClO3 = 0,225 mol
=>mO2 = 0,225 . 32 = 7,2 g
\(n_{KClO3\left(pư\right)}=\frac{61,25}{122,5}.80\%=0,4\left(mol\right)\)
PTHH: 2KClO3 --to--> 2KCl + 3O2
0,4 ------------> 0,4 ----> 0,6 (mol)
=> \(m_{KCl}=0,4.74,5=29,8\left(g\right)\)
=> \(V_{O2}=0,6.22,4=13,44\left(l\right)=13440ml\)
a) \(2KClO_3--to->2KCl+3O_2\left(1\right)\)
1,6___________________1,6____ 2,4
=>\(n_{O_2}=\dfrac{53,76}{22,4}=2,4\left(mol\right)\)
Đặt a là số mol KClO3 bđ
=> (a-1,6).122,5+1,6.74,5=168,2
=>a=2
=>\(m_{KClO_3\left(bđ\right)}=2.122,5=245\left(g\right)\)
=>\(m_{KClO_3\left(sau\right)}=1,6.122,5=196\left(g\right)\)
=>\(\%m_{KClO_3}=\dfrac{196}{245}.100=80\%\)
b) \(2KMnO_4--to->K_2MnO_4+MnO_2+O_2\left(2\right)\)
4,8_____________________________________ 2,4
=>\(m_{KMnO_4\left(pứ\right)}=4,8.158=758,4\left(g\right)\)
=>\(m_{KMnO_1\left(bđ\right)}=\dfrac{758,4.100}{90}=842,67\left(g\right)\)
a. \(2KMnO_4\rightarrow K_2MnO_4+MnO_2+O_2\)
\(n_{KMnO_4}=0,6mol\)
\(\rightarrow n_{O_2}=\frac{1}{2}n_{KMnO_4}=0,3mol\)
\(\rightarrow V_{O_2}=6,72l\)
\(V_{O_2\text{thực}}=\frac{6,72.75}{100}=5,04l\)
b. \(2KMnO_4\rightarrow K_2MnO_4+MnO_2+O_2\)
\(n_{O_2}=1,5mol\)
\(\rightarrow n_{KMnO_4}=2n_{O_2}=3mol\)
\(\rightarrow m_{KMnO_4\text{cần}}=\frac{474.100}{80}=592,5g\)
2KClO3\(\overset{MnO_2,t^0}{\rightarrow}2KCl+3O_2\)
\(n_{O_2}=\dfrac{v}{22,4}=\dfrac{4,48}{22,4}=0,2mol\)
\(n_{KClO_3}=\dfrac{2}{3}n_{O_2}=\dfrac{0,4}{3}mol\)
-Vì hao hụt 20% nên hiệu suất phản ứng đạt: 100%-20%=80%
\(m_{KClO_3}=\dfrac{0,4}{3}.122,5.\dfrac{100}{80}\approx20,42gam\)
1) \(2KClO3-->2KCl+3O2\)
\(n_{KClO3}=\frac{12,25}{122,5}=0,1\left(mol\right)\)
\(n_{O2}=\frac{3}{2}n_{KClO3}=0,15\left(mol\right)\)
\(V_{02}=0,15.22,4=5,6\left(l\right)\)
2) \(2KClO3-->2KCl+3O2\)
\(n_{O2}=\frac{48}{32}=1,5\left(mol\right)\)
\(n_{KClO3}=\frac{2}{3}n_{O2}=1\left(mol\right)\)
\(m_{KClO3}=1.122,5=122,5\left(g\right)\)
3) \(2KMnO4-->K2MnO4+MnO2+O2\)
\(n_{O2}=\frac{2,8}{22,4}=0,125\left(mol\right)\)
\(n_{KMnO4}=2n_{O2}=0,25\left(mol\right)\)
\(m_{MnO4}=0,25.158=39,5\left(g\right)\)
nO2= 5,6/22,4= 0,25mol→mO2=8(g)
mO2 bị hao hụt 10% là: 8x90:100= 7,2(g)
PTHH: 2KClO3 → 2KCl + 3O2
Theo pt: 245 149 96 (g)
Theo bài ra: 11,84 ← 7,2 (g)
TICK CHO MIK NHOA!!!
a, Ta có nO2 = \(\dfrac{6,72}{22,4}\) = 0,3 ( mol )
2KClO3 → 2KCl + 3O2
0,2................0,2......0,3
=> mKClO3 = 122,55 . 0,2 = 24,5 ( gam )
\(n_{O_2} = \dfrac{6,72}{22,4} = 0,3(mol)\)
\(2KClO_3 \xrightarrow{t^o} 2KCl + 3O_2\)
Theo PTHH :
\(n_{KClO_3\ phản\ ứng} = \dfrac{2}{3}n_{O_2} = 0,2(mol)\\ \Rightarrow n_{KClO_3\ cần\ dùng} = \dfrac{0,2}{70\%} = \dfrac{2}{7}(mol)\\ \Rightarrow m_{KClO_3\ cần\ dùng} = \dfrac{2}{7}.122,5 = 35(gam)\)
hello người ở hiện tại=))