a, \(\dfrac{V_{CO_2}}{V_{O_2}}=\dfrac{n_{CO_2}}{n_{O_2}}=\dfrac{5}{1}\)
→ Gọi: nO2 = a (mol) ⇒ nCO2 = 5a (mol)
\(\Rightarrow M_A=\dfrac{32a+44.5a}{a+5a}=42\left(g/mol\right)\)
\(\Rightarrow d_{A/kk}=\dfrac{42}{29}\approx1,45\)
b, Ta có: \(n_A=\dfrac{10,5}{42}=0,25\left(mol\right)\Rightarrow V_A=0,25.22,4=5,6\left(l\right)\)