A solution made by dissolving 9.81 g of a nonvolatile, nonelectrolyte in 90.0 g of water boiled at 100.37 °C at 760 mm Hg. What is the molar mass of the substance? [kp = 0.51 °c/m]

151 g/mol

Explanation:

In order to solve this problem we need to keep in mind the formula for the boiling point elevation:

Where:

Input the data and calculate m:

We now can calculate the number of moles of the substance, using the definition of molarity:

In this case kg of solvent = 90.0 g / 1000 = 0.090 kg

Finally we calculate the molar mass, using the number of moles and the mass:

icc, international association for cereal chemistry

i think   the answer is c hope i'm right