When a 194-G Sample of an Unknown Compound Is Dissolved in 458

question 105

Multiple Choice

When a 19.4-g sample of an unknown compound is dissolved in 458.0 g of benzene, the freezing point of the resulting solution of 3.82°C. The freezing point of pure benzene is 3.86°C, and K_f for benzene is 5.12°C/m. Calculate the molar mass of the unknown compound.

• A) 7.47 × 10³ g/mol
• B) 5.62 × 10¹ g/mol
• C) 9.34 × 10² g/mol
• D) 2.81 × 10¹ g/mol
• E) 1.34 × 10² g/mol

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Positions of authority or responsibility within an organization or government that are assigned to individuals rather than elected.