What Is the Molar Mass of an Unknown Gas If

question 16

Multiple Choice

What is the molar mass of an unknown gas if a sample weighing 0.389 g is collected in a flask with a volume of 102 cm³ at 97°C and at a pressure of 728 mmHg? (R = 0.08206 L • atm/K • mol, 1 atm = 760 mmHg) .

• A) 187 g/mol
• B) 121 g/mol
• C) 112 g/mol
• D) 31.6 g/mol
• E) 8.28 × 10^-3 g/mol

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