Question

A 9.365 μg sample of a compound contains 1.334 x 10^17 molecules. What is the molar mass (in g/mol) of this compound?

a. 117.6
b. 220.5
c. 325.8
d. 532.4

Answer 1

The molar mass of the compound is 176.124 g/mol, and the given number of moles is a very small fraction of a mole. Thus, the corresponding mass is expected to be about one-ten thousandth of the molar mass.

Step-by-step explanation:

The molar mass for this compound is computed to be 176.124 g/mol. The given number of moles is a very small fraction of a mole (~10-4 or one-ten thousandth); therefore, the corresponding mass is expected to be about one-ten thousandth of the molar mass (-0.02 g).

Performing the calculation yields: