Which of these is always equal to the molar mass of any element?

its atomic number
its atomic weight
its atomic formula
its atomic structure

Option (b) is the correct answer.

Explanation:

Atomic weight is also known as atomic mass or molar mass of an atom.

Atomic mass means the sum of total number of protons and neutrons present in an atom.

For example, atomic mass of HCl is atomic mass of hydrogen + atomic mass of chlorine.

That is, atomic mass of HCl is 1.01 g/mol + 35.453 g/mol = 36.463 g/mol

Thus, we can conclude that molar mass of any element is always equal to its atomic weight.

a rain shadow is a dry region of land on the side that is protected against the prevailing winds of a mountain range. the prevailing winds are the winds that occur most of the time in a particular place of the earth

prevailing winds carry air toward the mountain range. as the air rises up over a mountain range, the air cools, water vapor condenses, and clouds form. on this side of the mountains, called the windward side, precipitation falls in the form of  rain  or snow. this dry air produces a  rain shadow.