How many moles of photons at a wavelength of 378nm does ittake
to produce 256kj of energy?

The atomic nucleus made up from protons (yellow) and neutrons (blue) and held together by nuclear forces. nuclear forces (also known as nuclear interactions or strong forces) are the forces that act between two or more nucleons. they bind protons and neutrons (“nucleons”) into atomic

The answer to your question would be c. mineral oil  

The answer will be c