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The great French chemist Antoine Lavoisier discovered the Law of Conservation of Mass in part by doing a famous experiment in 1775. In this experiment
Lavoisier found that mercury(II) oxide, when heated, decomposed into liquid mercury and an invisible and previously unknown substance: oxygen gas.

2. Suppose 29.0 mL of dioxygen gas are produced by this reaction, at a temperature
of 100.0 °C and pressure of exactly 1 atm. Calculate the mass of mercury(II) oxide