Question: what is the energy equivalent of 1 gram of substance?
Answer: If you're looking to find how much energy is in one gram of a given substance with mass, disregarding some math, just take mass and multiply it by c^2. So m = 1g = 0.001kg, E = mc^2 = (0.001kg)(299792458m/s)^2 = 8.987551787E13kgm^2/s^2 = 8.99 x 10 ^ 13 joules.