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(Ithink someone has gained weight resently!)
If the endothermic reaction end-product is heavier, then what is the additional mass comprised/made of?
Patrick Poisson asked the Naked Scientists: Does an endothermic reaction produce an end product heavier than its constituent parts prior to the reaction?
i.e. was some amount of matter created from energy drawn from the surrounding system and conversely does an exothermic reaction convert a miniscule amount of matter into energy?
energy itself has mass at all times, no matter what form it is in.