To identify a diatomic gas (x2), a researcher carried out the following experiment: she weighed an empty 5.8-l bulb, then filled it with the gas at 1.00 atm and 21.0 ∘c and weighed it again. the difference in mass was 6.7 g. identify the gas. express your answer as a chemical formula.
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The number of moles of a given mass of a substance can be found without knowing its molecular formula or molar mass. true false
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