Standed project shelter design

Determine the number o moles of ions/atoms/particle in the following: 2.50 miles of k2s (let me know how to do)

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

What is the mass of phosphorous in a 51-kg person