For an unknown compound, scientists determine that 432.4 pg of the compound contains 5.917 x 10^12 molecules. What is the molar mass of the compound in grams per mole?

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Collen VonLv2

13 Dec 2019

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A solution of 12.00 grams of an unknown nonelectrolyte compound is dissolved in 200.0 grams of benzene. The resultant solution freezes at 3.45^oC. What is the molar mass of the unknown compound? [The freezing point of pure benzene is 5.45^oC ; the K_f for benzene is 5.07^oC m^-1]. (Hint: this is a two-step challenge, involving first finding the number of moles of solute in the solution from the freezing point data and then its molar mass in units of grams/mole)

A. 125 grams per mole

B. 152 grams per mole

C. 88.2 grams per mole

D. 55.8 grams per mole

E. 193 grams per mole

Which statement is incorrect; one mole equals:

A) 1 molar mass of a compound

B) 6.022 x 10^23 grams of a compound

C) 6.022 x 10^23 molecules or formula units

D) 1 atomic mass of a mono atomic element