Which of the following statements is true about gasses?

1)density cannot be determined for a gas.
2)the volume of a gas is always equal to the volume of the enclosing container.
3)the density of a gas equals volume per unit mass.
4)a balloon containing a gas with greater density than air will rise.

i think it is 2 but i'm not sure

2)The volume of a gas is always equal to the volume of the enclosing container.

Explanation:

chemical digestion occurs in the stomach were hcl and pepsin forms chyme, the mouth in which salivary amylase breaks down starch to form bolus, and the small intestine specifically the duodenum.

the positions which points up in upward carbon and down in downward carbon are axial

and vice versa holds true for equatorial positions

so the correct answer with labelled diagram will be