Is the molecular mass of nitrogen gas #28*"amu"#?
Well, I know this because I have access to a Periodic Table of elements, which tells us the atomic mass of all the known elements. Such Periodic Tables should be made available to you in all examinations in Chemistry and Physics that you ever sit.
And the Periodic Table lists
But we are not finished there. Nitrogen is a room temperature,
Have you got a Periodic Table beside you? You will soon remember the molar masses of common elements...........