What is the mass of 3.12 x 1021 formula units of KBr?

Different isotopes indicate that an element will have different numbers of

The image shows a process that releases nuclear energy which statement best identifies the process shown the process must be fusion because energy is released the process must be fusion because of have your nucleus formed a smaller nuclei the process must be fission because a large nucleus breaks into smaller nuclei the process must be fission because neutrons are formed

What mass of natural gas (ch4) must you burn to emit 276 kj of heat?