How many grams of mercury(II) oxide are needed to produce 3.92 L of oxygen gas according to the following reaction at 25 °C and

Question

How many grams of mercury(II) oxide are needed to produce 3.92 L of oxygen gas according to the following reaction at 25 °C and 1 atm?
mercury(II) oxide (s) → mercury (f) + oxygen (g)

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