Question 16 of 25 2 Points
What is the mass percent composition of an element in a molecule?
A. The fraction of the molecule's mass that comes from the
element's mass
B. The fraction of the total number of atoms in the molecule that
comes from the element
C. The element's mass in the empirical formula divided by its
molecular formula mass
O D. The fraction of the element's mass that comes from one atom of
the element

C. The element's mass in the empirical formula divided by its

Explanation:

Not sure though

the reaction mixture contains some ammonia, plus a lot of unreacted nitrogen and hydrogen. the mixture is cooled and compressed, causing the ammonia gas to condense into a liquid. the liquefied ammonia is separated and removed. the unreacted nitrogen and hydrogen are then recycled back into the reactor .

the formula mass of a molecule or a compound is the sum of the atomic weights of the atoms in its empirical formula

(that's what i know about formula mass)