Problem: A 118-mL flask is evacuated and found to have a mass of 97.129 g. When the flask is filled with 768 torr of helium gas at 35 oC, it is found to have a mass of 97.171 g.Was the helium gas pure?

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We are asked if the helium gas pure.


Calculate mass of gas: 

Mass gas = 97.171 g - 97.129 g = 0.042 g


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Problem Details

A 118-mL flask is evacuated and found to have a mass of 97.129 g. When the flask is filled with 768 torr of helium gas at 35 oC, it is found to have a mass of 97.171 g.

Was the helium gas pure?

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