If you don't have the mass, but you've got avagadros and the mr then how do you work out the mass

Bohr's model could only explain the spectra of which type of atoms? single atoms with one electron single atoms with more than one electron bonded atoms with one electron bonded atoms with more than one electron

All cells are made of four types of acids, lipids, proteins, and carbohydrates.

Athe top of a hill, an athlete on a skateboard has x joules of mechanical energy. how much mechanical energy will she have at the bottom of the hill? ignore the effects of friction.