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To identify a diatomic gas (X2), a researcher carried out the following experiment: She weighed an...

To identify a diatomic gas (X2), a researcher carried out the following experiment: She weighed an empty 0.80-L bulb, then filled it with the gas at 1.60 atm and 21.0 ∘C and weighed it again. The difference in mass was 1.5 g . Identify the gas.

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