How to convert 1.2×10^24 atoms of magnesium into moles? ?

What is the empirical formula of a compound that is 50.7% antimony and 49.3% selenium ?

Charlene puts together two isosceles triangles so that they share a base, creating a kite. the legs of the triangles are 10 inches and 17 inches, respectively. if the length of the base for both triangles is 16 inches long, what is the length of the kite’s other diagonal? 6 inches inches inches 21 inchesanswer is d on e2020edit: it's geometry not chemistry, sorry.

X-rays are used instead of visible light because x-rays have shorter than visible light, allowing them to produce images of much greater detail. a) energies b) frequencies c) speeds d) wavelengths