PTHH: \(2KClO_3\underrightarrow{t^o}2KCl+3O_2\uparrow\) (1)
\(4P+5O_2\underrightarrow{t^o}2P_2O_5\) (2)
\(C+O_2\underrightarrow{t^o}CO_2\) (3)
a) Ta có: \(n_{KClO_3}=\dfrac{24,5}{122,5}=0,2\left(mol\right)=n_{KCl}\)
\(\Rightarrow m_{KCl\left(lýthuyết\right)}=0,2\cdot74,5=14,9\left(g\right)\) \(\Rightarrow H\%=\dfrac{17,3}{14,9}\cdot100\%\approx116,11\%\)
b) Theo PTHH: \(\Sigma n_{O_2}=0,3mol\)
+) Xét bình có photpho
Vì oxi chắc chắn dư nên tính theo photpho
Ta có: \(n_P=\dfrac{4,96}{31}=0,16\left(mol\right)\)
\(\Rightarrow\left\{{}\begin{matrix}n_{P_2O_5}=0,08\left(mol\right)\\n_{O_2\left(dư\right)}=0,1\left(mol\right)=n_{O_2\left(3\right)}\end{matrix}\right.\) \(\Rightarrow\left\{{}\begin{matrix}m_{P_2O_5}=0,08\cdot142=11,36\left(g\right)\\m_{O_2\left(dư\right)}=0,1\cdot32=3,2\left(g\right)\end{matrix}\right.\)
+) Xét bình 2
Ta có: \(n_C=\dfrac{0,3}{12}=0,025\left(mol\right)\)
Xét tỉ lệ: \(\dfrac{0,1}{1}>\dfrac{0,025}{1}\) \(\Rightarrow\) Oxi còn dư, Cacbon p/ứ hết
\(\Rightarrow\left\{{}\begin{matrix}n_{CO_2}=0,025\left(mol\right)\\n_{O_2\left(dư\right)}=0,075\left(mol\right)\end{matrix}\right.\) \(\Rightarrow\left\{{}\begin{matrix}m_{CO_2}=0,025\cdot44=1,1\left(g\right)\\m_{O_2}=0,075\cdot32=2,4\left(g\right)\end{matrix}\right.\)
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https://hoc24.vn/hoi-dap/tim-kiem?q=Nung+24.5+gam+KClO3+m%E1%BB%99t+th%E1%BB%9Di+gian+thu+%C4%91%C6%B0%E1%BB%A3c+17.3+gam+ch%E1%BA%A5t+r%E1%BA%AFn+A+v%C3%A0+kh%C3%AD+B.D%E1%BA%ABn+to%C3%A0n+b%E1%BB%99+kh%C3%AD+B+v%C3%A0o+b%C3%ACnh+1+%C4%91%E1%BB%B1ng+4.96+gam+ph%E1%BB%91tpho+nung+n%C3%B3ng+ph%E1%BA%A3n+%E1%BB%A9ng+xong+d%E1%BA%ABn+kh%C3%AD+B+v%C3%A0+b%C3%ACnh+2+%C4%91%E1%BB%B1ng+3+gam+c%C3%A1cbon+%C4%91%E1%BB%83+%C4%91%E1%BB%91t.++a)t%C3%ADnh+%kh%E1%BB%91i+l%C6%B0%E1%BB%A3ng+KClO3+%C4%91%C3%A3+d%C3%B9ng+++b)T%C3%ADnh+s%E1%BB%91+ph%C3%A2n+t%E1%BB%AD+,+kh%E1%BB%91i+l%C6%B0%E1%BB%A3ng+c%C3%A1c+ch%E1%BA%A5t+trong+m%E1%BB%97i+b%C3%ACnh+sau+ph%E1%BA%A3ng+%E1%BB%A9ng.&id=172571