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7. A solution is prepared by mixing 25 mL pentane (CsH12, d 0.63 g/mL) with 45 mL hexane (CeHh4,d 0.66 g/mL). Assume that the volumes add on mixing, calculate the molality a. 0.217 m b. 0.25 m c. 13.4 m d. 7.3 m A chemist is trying to identify a human hormone that controls metabolism by determining its molar mass. A sample weighing 0.546 g was dissolved in 15.0 g benzene, and the freezing point depression was determined to be 0.240°C. Calculate the molar mass of the hormone. a. 700 g/mol 8. b. 776 g/mol c. 12.5 g/mol d. 177 g/mol

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