you are surprised to see it slowly dropping. You measure the mass of the gas-filled container and find that the mass is what it should be-gas plus container-and the mass does not change over time

so you do not have a leak. Suggest an explanation for your observations.
Q:The temperature of a 5.00-L container of N2 gas isThe temperature of a 5.00-L container of N2 gas is increased from 20oC to 250oC. If the volume is held constant

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