Einstein's formula tells us the amount of energy to which a given mass would be equivalent, if it were all suddenly turned into energy.
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Einstein's famous equation, E = mc^2 relates the mass (m) of an object to energy (E). The speed of light (c), is the constant of proportionality. Einstein formulated the equation within his theory of special relativity. Indeed, a physical interpretation of this equation is that any given mass is equivalent to the energy given by the equation, if it were suddenly converted to energy. Therefore the answer to the question is true. 

Exothermic,  physical change after it is already baked