Sodium-24 has a half-life of 15 hours. How much sodium-24 will remain in a 78 gram sample after 90 hours?

Igonna be honest i dunno that one srry

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

Is there a picture or answer choices?

Answer(false);