All of them are right except the neutron one. The neutrons is actually 176 because you subtract the number of protons from the atomic mass to find this.
The answer would have to be letter b. Energy
Answer:
Rocket engines
Explanation:
U know how I know it? Well I'm an astrophysicist and of course I watch star wars...
Volume = 20.0 cm³
density = 19.3 g/cm³
Therefore:
mass = density * volume
mass = 19.3 * 20.0
mass = 386 g
