How many nitrogen atoms are in 2 formula units of magnesium nitrate?

What is the chemical formula of the following compound

The rules of engagement (roe) working group is often used to (select all that apply.)

Three cards with holes are arranged in a straight line. a light is shined through the first card’s hole and travels through all three cards. what does this tell you about light rays? a) that light is reflected b) that light is refractive c) that light travels in a straight line d) that light does not travel in a straight line