Oxit + CO \(\rightarrow\) Rắn + B
Gọi số mol CO là x; CO2 là y
\(\rightarrow M_B=20,5.2=41\rightarrow n_B=\frac{32,8}{41}=0,8\left(mol\right)=x+y\)
\(\rightarrow n_{CO_{bandau}}=n_B=0,8\rightarrow V=0,8.22,4=17,92\left(l\right)\)
\(\rightarrow m_B=28x+44y=32,8\)
Giải được: \(\rightarrow\left\{{}\begin{matrix}x=0,15\\y=0,65\end{matrix}\right.\)
\(\rightarrow n_{O_{bi.khu}}=n_{CO2}=0,65\left(mol\right)\)
\(\rightarrow a=39,6-0,65.16=29,2\left(g\right)\)