Final answer:
A giant molecular cloud typically has a mass that ranges from thousands to about 3 million solar masses, containing clumps and cores which are precursors to star formation.
Step-by-step explanation:
The typical mass of a giant molecular cloud ranges from thousands to about 3 million solar masses. These clouds are denser than the average interstellar space, containing a significant fraction of the mass of gas in the Milky Way. Within these molecular clouds are regions known as clumps, with masses of 50 to 500 solar masses, and even denser regions called cores, which are the formation sites of stars.