Problem: To identify a diatomic gas (X2), a researcher carried out the following experiment: She weighed an empty 1.1-L bulb, then filled it with the gas at 1.90 atm and 24.0°C and weighed it again. The difference in mass was 2.3 g. Identify the gas. Express your answer as a chemical formula.

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To identify a diatomic gas (X2), a researcher carried out the following experiment: She weighed an empty 1.1-L bulb, then filled it with the gas at 1.90 atm and 24.0°C and weighed it again. The difference in mass was 2.3 g. Identify the gas. 

Express your answer as a chemical formula.

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