A sample of 1.58 g of an unknown gas has a volume of 0.682 L.The sample is kept at 60°C,and exerts a pressure of 1.38 atm.What is the gas? A) Cl₂ B) NO C) NO₂ D) SO₂ E) C₂H₆

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We can use the ideal gas law to determine the molar mass of the gas, which will help identify the gas. PV = nRT n = mass/molar mass Substituting and solving for molar mass: (mass/V)RT/P = molar mass (1.58 g/0.682 L)(0.0821 L*atm/mol*K)(333 K)/(1.38 atm) = 56.1 g/mol Looking at the answer choices, only option C (NO₂) has a molar mass close to 56.1 g/mol (N = 14.0, O = 16.0, S = 32.1, for a total of 62.1 g/mol).

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