We will measure the mass of 50.0 mL of gas in this syringe.

We will start by weighing the empty syringe. Then we will weigh the syringe containing our gas sample.

We need to decide how to weigh the syringe. The plunger could be pushed in as shown here or pulled out to 50.0 mL. If pulled out, the syringe could be filled with air or have a vacuum inside.

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