What is the mass, in g, of one molecule of ethane, C2H6?

A. 3.0 x 10-23

B. 5.0 x 10-23

C. 30

D. 1.8 x 1025

B. 5.0 x 10^ (-23)

Explanation:

m = n * MM

where

m is mass

n is moles

MM is molecular mass

One molecule of a substance is 1 / 6.022 * 10^23 moles

The molecular mass of C2H6 is the sum of the atomic masses of each of the atoms present in the molecule. 2 carbon atoms + 6 hydrogen atoms. This gives

30.07.

So m = (1 / (6.022*10^23)) * 30.07 = 5.0 * 10^ (-23)