When a 491-G Sample of an Unknown Compound Is Dissolved in 500

question 47

Multiple Choice

When a 49.1-g sample of an unknown compound is dissolved in 500.g of benzene,the freezing point of the resulting solution is 3.77°C.The freezing point of pure benzene is 5.48°C and K_f for benzene is 5.12°C/m.Calculate the molar mass of the unknown compound.

• A)147 g/mol
• B)28.7 g/mol
• C)251 g/mol
• D)588 g/mol
• E)294 g/mol

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Definitions:

Social Facilitation Effect

The tendency for people to perform differently when in the presence of others, usually better on well-practiced tasks and worse on new tasks.

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The inherent susceptibility to certain conditions or characteristics based on one's genetic makeup.

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Incites feelings, often of interest or excitement, in a group or individual.

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The change in opinions or behavior that occurs when an individual conforms to what they believe is the correct way to act, based on information from others.