Bài 2 :
\(n_{KClO3}=\dfrac{36,75}{122,5}=0,3\left(mol\right)\)
Pt : \(2KClO_3\underrightarrow{t^o}2KCl+3O_2|\)
2 2 3
0,3 0,45
\(n_{O2}=\dfrac{0,3.3}{2}=0,45\left(mol\right)\)
\(V_{O2\left(dktc\right)}=0,45.22,4=10,08\left(l\right)\)
Pt : \(4P+5O_2\underrightarrow{t^o}2P_2O_5|\)
4 5 2
0,36 0,45 0,18
\(n_P=\dfrac{0,45.4}{5}=0,36\left(mol\right)\)
⇒ \(m_P=0,36.31=11,16\left(g\right)\)
\(n_{P2O5}=\dfrac{0,45.2}{5}=0,18\left(mol\right)\)
⇒ \(m_{P2O5}=0,18.142=25,56\left(g\right)\)
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