Gọi: \(\left\{{}\begin{matrix}n_{SO_2}=x\left(mol\right)\\n_{H_2}=y\left(mol\right)\end{matrix}\right.\) \(\Rightarrow x+y=\dfrac{134,4}{22,4}=6\left(mol\right)\left(1\right)\)
Mà: mA = 136 (g) ⇒ 64x + 2y = 136 (2)
Từ (1) và (2) \(\Rightarrow\left\{{}\begin{matrix}x=2\left(mol\right)\\y=4\left(mol\right)\end{matrix}\right.\) \(\Rightarrow\left\{{}\begin{matrix}\%m_{SO_2}=\dfrac{2.64}{136}.100\%\approx94,12\%\\\%m_{H_2}\approx5,88\%\end{matrix}\right.\)