2. A 2.62 gram sample of an unknown solid was dissolved in 43.5 grams of ethanol. The solution boiled at 79.0 C (at 1 atm atmospheric pressure). What is the molar mass of the solid? How accurately can this molar mass be determined with a thermometer that reads only to the nearest 0.1 C?

3. When 2.62 grams of an unknown solute was placed in 22.4 grams of liquid naphthalene, the solution boiled at 222.68 C. What is the molar mass of the solute?