Could someone help out with this? (I added a pic below)

What is the mass of 8 moles of sodium atoms

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

How can one make a supersaturated solution? (apex)