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Q.
$2H_2 + O_2 \to 2H_2O$
$2\,g H_2$ and $1\,O_2$ react to form $H_2O$
Some Basic Concepts of Chemistry
Solution:
$\underset{\text{4 R}}{2H_{2}}+ \underset{\text{32 g}}{O_{2}}\to \underset{\text{36 g}}{2H_{2}O}$
Here $O_{2}$ is the limiting reactant
$32\, g$ of $O_{2}$ gives $36 \,g$ of water
$1\,g$ of $O_{2}$ gives $\frac{36}{32}\,g$ of water
$=1.125\,g$ of water