Form of energy also known as light energy

Calculate the number of molecules present in 0.750 mol of mgo.

This classification of drug typically changes the brain's chemistry and reduces its ability to create its own endorphins.

If a molecule with a molecular formula of c13h18 is treated with an excess of h2 in the presence of finally divided pt metal under conditions required for maximum hydrogenation of the molecule to give a molecule with a formula c13h24, how many rings are in the molecule?