Answer
$CO_2(g)+2NaOH(aq)\longrightarrow Na_2CO_3(aq)+H_2O(l)$
Work Step by Step
$CO_2(g)+2NaOH(aq)\longrightarrow Na_2CO_3(aq)+H_2O(l)$ is balanced with two moles $NaOH$.
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