\(n_{H_2O}=\dfrac{18}{18}=1\left(mol\right)\\ PTHH:2H_2+O_2\xrightarrow[]{t^0}2H_2O\\ n_{H_2}=n_{H_2O}=1mol\\ V_{H_2O}=1.22,4=22,4\left(l\right)\)
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