PT: \(2H_2O\underrightarrow{đp}2H_2+O_2\)
Giả sử: \(n_{H_2O}=x\left(mol\right)\)
Theo PT: \(\left\{{}\begin{matrix}n_{H_2}=n_{H_2O}=x\left(mol\right)\\n_{O_2}=\frac{1}{2}n_{H_2O}=\frac{1}{2}x\left(mol\right)\end{matrix}\right.\)
Mà: \(n_{hhk}=\frac{0,672}{22,4}=0,03\left(mol\right)\)
\(\Rightarrow x+\frac{1}{2}x=0,03\Rightarrow x=0,02\left(mol\right)\)
\(\Rightarrow m_{H_2O}=0,02.18=0,36\left(g\right)\)
Bạn tham khảo nhé!