The empirical formula of an organic compound is C2H4O C
2
H
4
O
. Based on the empirical formula, oxygen is what percent of this compound?

The correct answer is "atomic weight".

Firstly, the water in the dams hold gravitational potential energy as they are above ground level. the gravitational potential energy is then transferred to kinetic energy as it falls, spinning the turbinethe turbine then spins the generator, which is a large magnet surrounded by metal coils. by doing this, the generator generates electricity. in this action, the energy transfer taken place is kinetic to electric energy

The answer is solid copper 

I'm sorry but, is there a list of options?