# What is the total masses of the reactants for the equation: 2SeO_2 (g) + O_2->2SeO_3 (g)?

$2 S e {O}_{2} \left(g\right) + {O}_{2} \left(g\right) \rightarrow 2 S e {O}_{3} \left(g\right)$
The equivalent mass of $S e {O}_{2}$ is $126.96$ $g \cdot m o {l}^{-} 1$. Dioxygen gas has an equivalent mass of $32.00$ $g \cdot m o {l}^{-} 1$. So the reactant mass is $126.96 \cdot g \times 2 + 32.00 \cdot g$ $=$ ??g.
What mass of $S e {O}_{3} \left(g\right)$ results?
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