Se recoge un litro de acetona a 20° C y 850 mmHg el gas obtenido tiene una humedad relativa del 75% calcular: a) la masa de la acetona que se ha evaporado b) la masa de la acetona que retorna al estado líquido si el gas comprime isotermicamente hasta 5 atmósferas

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

Your question is not clear but if you can explain yourself i would be glad to .  just trying to : ))