We are asked if the helium gas pure.
Calculate mass of gas:
Mass gas = 97.171 g - 97.129 g = 0.042 g
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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