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At equilibrium, the following decomposition reaction has 2.38 g NaNO3, 3.92 g NaNO2, and 1.29 g O2.2 NaNO3 (s) → 2 NaNO2 (s) + O2 (g)How much in grams of NaNO3 is there originally if it is the only substance at the start of the reaction?

At equilibrium, the following decomposition reaction has 2.38 g NaNO₃, 3.92 g NaNO₂, and 1.29 g O₂.
2 NaNO₃ (s) → 2 NaNO₂ (s) + O₂ (g)
How much in grams of NaNO₃ is there originally if it is the only substance at the start of the reaction?