# $2H_2+O_2\rightarrow 2H_2O$.2g $H_2$ and 1g $O_2$ react to form $H_2O$
$\begin{array}{1 1}(a)\;3.0g& \\ (b)\;1.125g \\(c)\;4.5g \\(d)\;2.50g \end{array}$