Bài 1:
PTHH: \(2H_2+O_2\underrightarrow{t^o}2H_2O\)
Ta có: \(\left\{{}\begin{matrix}n_{H_2}=\dfrac{4,48}{22,4}=0,2\left(mol\right)\\n_{O_2}=\dfrac{9,6}{32}=0,3\left(mol\right)\end{matrix}\right.\)
Xét tỉ lệ: \(\dfrac{0,2}{2}< \dfrac{0,3}{1}\) \(\Rightarrow\) Oxi còn dư, Hidro p/ứ hết
\(\Rightarrow n_{H_2O}=0,2\left(mol\right)\) \(\Rightarrow m_{H_2O}=0,2\cdot18=3,6\left(g\right)\)