To identify a diatomic gas (\rm X_2), a researcher carried out the following experiment: She weighed an empty 1.00-\rm L bulb, then filled it with...

To identify a diatomic gas (rm X_2), a researcher carried out the following experiment: She weighed an empty 1.00-rm L bulb, then filled it with the gas at 1.10 rm atm and 23.0 ^circrm C and weighed it again. The difference in mass was 1.27 rm g. Identify the gas.Express your answer as a chemical formula.