Question: 1 gram mass is equivalent to energy?
Answer: Answer 2: E = M C2 relates energy to mass. Specifically it says that if you convert 1 g of mass to energy, you get 9 x 1020 ergs of energy -- (To use this just keep consistent units -i.e. Joules, Meters, Seconds, Kilograms, and Ergs, centimeters, grams, seconds.