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I will assume the ether behaves as an ideal gas. In that case, a mole (gram molecular weight) of the gas occupies 22.4 liters at STP.
If 3.96 liters weigh 8.12 grams, then 22.4 liters weighs x where:
8.12/3.96 = x/22.4
Turn the crank, and 22.4 liters of ether weigh 45.9 grams, the gram molecular weight of ether.
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