How much energy (in J)is produced when 0.067 g of matter is converted to energy?

Question

Quizplus · Accepted Answer

To calculate the energy produced when matter is converted to energy, we can use the famous equation by Albert Einstein: E=mc^2, where E is the energy produced, m is the mass that is converted, and c is the speed of light. 
Substituting the given values: 
E = (0.067 g) x (3 x 10^8 m/s)^2 
E = 6.03 x 10^13 J 
Rounding off to two significant figures, 
E = 6.0 x 10^13 J 
Hence, the best choice is (B).

How Much Energy (In J)is Produced When 0