My friend recently went to Comic-Con and purchased a Power Ring (like Green Lant

Question

My friend recently went to Comic-Con and purchased a Power Ring (like Green Lantern's ring) that he swears is the real thing. A real Power Ring, according to DC comics, is supposedly made of an element called Oaite from the planet Oa. I, of course, am skeptical of his purchase. So, we take the ring's mass and find it to be 76.986 g. Then, we drop it into a graduated cylinder and find that it displaces 0.004555 L. Assume the following density values are true: Oaite = 16.901 g/cm^3; Gold = 20.282 g/cm^3; Nickel = 9.912 g/cm^3; Platinum = 20.460 g/cm^3; Silver = 11.501 g/cm^3; Titanium = 4.500 g/cm^3; Chromium = 7.150 g/cm^3. So what have we discovered?

Explanation / Answer

mass of ring = 76.986 g
volume of ring = 0.004555 L = 4.555 mL = 4.555 cm^3
density of ring = mass/volume
= 76.986/4.555
= 16.901 g/cm^3
which is same as density of Oaite

we discovered that power Ring is made up of Oaite

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