In lab, you have chosen to examine the properties of anideal mixture of tetrahydrofuran (THF, C4H8O) and dimethyl sulfoxide (DMSO,(CH3)2SO). You decide to mix 249 mL of THF and 671 mL of DMSO ata temperature of25C and find that the resulting solution has a density of1.031 g/cm3. You measure the vapor pressure of THF over the solution to be 47.0 mm Hg. From the CRC Handbook, youfind that at 25C, the densities of pure THF andDMSO are 0.889 g/cm3 and 1.100g/cm3, respectively, and that pure DMSO has a vaporpressure of 0.425 mm Hg at 25C and a normal boiling point of189C. Unfortunately, you were not able to find any data onTHF except that the normal boiling point is66C.

(a) Explain why THF and DMSO might bemiscible.

(b) What is the molarity and molality of THF in the DMSO solution?

(c) What are the mole fractions of each component in the solution?