A Sample of an Unknown Volatile Liquid Was Injected into a Dumas

question 149

Multiple Choice

A sample of an unknown volatile liquid was injected into a Dumas flask m_flask = 27.0928 g, v_flask = 0.1040 L) and heated until no visible traces of the liquid could be found. The flask and its contents were then rapidly cooled and reweighed (m_{flask + vapor} = 27.4593 g) . The atmospheric pressure and temperature during the experiment were 0.976 atm and 18.0 °C, respectively. The unknown volatile liquid was ________.

• A)C₆H₁₂
• B)C₆H₁₄
• C)C₇H₁₄
• D)C₇H₁₆
• E)C₆H₆

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