1. Ta có: \(d_{\dfrac{A}{O_2}}=\dfrac{M_A}{32}=0,5\left(lần\right)\)
\(\Leftrightarrow M_A=16\left(g\right)\)
Vậy A là nguyên tố oxi (O)
\(\Rightarrow m_O=\dfrac{4,48}{22,4}.16=3,2\left(g\right)\)
2.
- \(d_{\dfrac{NO}{N_2}}=\dfrac{30}{28}\approx1,07\left(lần\right)\)
- \(d_{\dfrac{NO_2}{N_2}}=\dfrac{46}{28}\approx1,64\left(lần\right)\)
- \(d_{\dfrac{CO_2}{N_2}}=\dfrac{44}{28}\approx1,57\left(lần\right)\)