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\(n_{KClO_3}=\dfrac{12,25}{122,5}=0,1\left(mol\right)\)
PTHH: 2KClO3 --to--> 2KCl + 3O2 - pư phân huỷ
0,1 0,1 0,15
\(\rightarrow m_{KCl}=0,1.74,5=7,45\left(g\right)\)
a/ PTHH: 2KClO3 =(nhiệt)==> 2KCl + 3O2
Áp dụng định luật bảo toàn khối lượng, ta có:
mKClO3 = mKCl + mO2
b/ Theo phần a/ ta có
mKClO3 = mKCl + mO2
<=> mO2 = mKClO3 - mO2 = 12,25 - 7,45 = 4,8 gam
c/
= 
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, \(4Al+3O_2\underrightarrow{t^o}2Al_2O_3\)
b, \(n_{Al}=\dfrac{8,1}{27}=0,3\left(mol\right)\)
Theo PT: \(n_{O_2}=\dfrac{3}{4}n_{Al}=0,225\left(mol\right)\Rightarrow V_{O_2}=0,225.22,4=5,04\left(l\right)\)
c, \(2KClO_3\underrightarrow{t^o}2KCl+3O_2\)
Theo PT: \(n_{KClO_3}=\dfrac{2}{3}n_{O_2}=0,15\left(mol\right)\Rightarrow m_{KClO_3}=0,15.122,5=18,375\left(g\right)\)
a, PT: \(2H_2+O_2\underrightarrow{t^o}2H_2O\)
Ta có: \(n_{H_2}=n_{O_2}=\dfrac{6,1975}{24,79}=0,25\left(mol\right)\)
Xét tỉ lệ: \(\dfrac{0,25}{2}< \dfrac{0,25}{1}\), ta được O2 dư.
Theo PT: \(n_{O_2\left(pư\right)}=\dfrac{1}{2}n_{H_2}=0,125\left(mol\right)\)
\(\Rightarrow n_{O_2\left(dư\right)}=0,25-0,125=0,125\left(mol\right)\)
\(\Rightarrow V_{O_2\left(dư\right)}=0,125.24,79=3,09875\left(l\right)\)
b, Theo PT: \(n_{H_2O}=n_{H_2}=0,25\left(mol\right)\)
\(\Rightarrow m_{H_2O}=0,25.18=4,5\left(g\right)\)
c, PT: \(2KClO_3\underrightarrow{t^o}2KCl+3O_2\)
Theo PT: \(n_{KClO_3}=\dfrac{2}{3}n_{O_2}=\dfrac{1}{6}\left(mol\right)\)
\(\Rightarrow m_{KClO_3}=\dfrac{1}{6}.122,5\approx20,42\left(g\right)\)
\(2KClO_3\rightarrow3O_2+2KCl\)
\(m_{KClO_3}=m_{O_2}+m_{KCl}\)
\(\Rightarrow m_{KCl}=m_{KClO_3}-m_{KCl}=24,5-9,6=14,9\left(g\right)\)
$n_{KClO_3} = \dfrac{12,25}{122,5} = 0,1(mol)$
$2KClO_3 \xrightarrow{t^o} 2KCl + 3O_2$
$n_{O_2} = 1,5n_{KClO_3} = 0,15(mol)$
$n_P = 0,5(mol)$
$4P + 5O_2 \xrightarrow{t^o} 2P_2O_5$
$n_P : 4 > n_{O_2} : 5$ nên P dư
$n_{P_2O_5} = \dfrac{2}{5}n_{O_2} = 0,06(mol)$
$m_{P_2O_5} = 0,06.142 = 8,52(gam)$
Bài 1:
\(n_{KClO_3}=\dfrac{12,25}{122,5}=0,1\left(mol\right)\\ PTHH:2KClO_3\underrightarrow{t^o}2KCl+3O_2\\ \left(mol\right).....0,1\rightarrow....0,1.......0,15\\ a,m_{KCl}=0,1.74,5=7,45\left(g\right)\\ V_{O_2}=0,15.22,5=3,36\left(l\right)\)
CaCO3 bạn nhé
Bài 2:
\(n_{CaCO_3}=\dfrac{10}{100}=0,1\left(mol\right)\\ PTHH:CaCO_3\underrightarrow{t^o}CaO+CO_2\\ \left(mol\right).....0,1\rightarrow....0,1.....0,1\\ m_{CaO}=0,1.56=5,6\left(g\right)\\ V_{CO_2}=0,1.22,4=2,24\left(l\right)\)