When a ton of coal burns, it loses 3.3 x 10-7 kg of mass. The energy given off is?

Question

A. 3.7 x 10-24J

B. 3.3 x 10-7 J

C. 100 J

D. 3.0 x 10 10 J

Answer 1

to solve this Q you need to the energy content of coal in J/KG

Answer 2

You can use E=mc² to solve this, where: m = 3.3e-7 kg, c=3e8 m/s.

The answer is D.