Exothermic chemical reactions in closed systems do not change mass, but become less massive once the heat of reaction is removed, though this mass change is much too small to measure with standard equipment.
Exothermic chemical reactions in closed systems do not change mass. The heat of reaction is removed. This mass change is much too small to measure with standard equipment. Exothermic chemical reactions in closed systems do not become less massive. The heat of reaction is removed. This mass change is much too small to measure with standard equipment.