4) In determining the identity of an unknown compound used in making resins, 0.134g of the compound was dissolved in 20.0g dimethyl sulfoxide (DMSO). The solution froze at 18.315 °C. a) What is the molality of the unknown compound? For DMSO, Tr= 18.52 °C; Kr = 3.85°C.kg/mol. b) How many moles of the unknown compound is present in the solution? c) What is the molar mass of the unknown compound? d) If the empirical formula of the unknown compound is CH2N2, what is its molecular formula?

4) In determining the identity of an unknown compound used in making resins, 0.134g of the compound was dissolved in 20.0g dimethyl sulfoxide (DMSO). The solution froze at 18.315 °C. a) What is the molality of the unknown compound? For DMSO, Tr= 18.52 °C; Kr = 3.85°C.kg/mol. b) How many moles of the unknown compound is present in the solution? c) What is the molar mass of the unknown compound? d) If the empirical formula of the unknown compound is CH2N2, what is its molecular formula?

Chemistry

10th Edition

ISBN:9781305957404

Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Chapter1: Chemical Foundations

Section: Chapter Questions

Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...

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4) In determining the identity of an unknown compound used in making resins,
0.134g of the compound was dissolved in 20.0g dimethyl sulfoxide (DMSO). The
solution froze at 18.315 °C.
a) What is the molality of the unknown compound? For DMSO, Tr= 18.52
°C; K = 3.85°C.kg/mol.
b) How many moles of the unknown compound is present in the solution?
c) What is the molar mass of the unknown compound?
d) If the empirical formula of the unknown compound is CH2N2, what is its
molecular formula?

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