Question

Can someone please shoe me how to do this problem. In 1 kilogram of pure water, the mass of hydrogen atoms is approx. 112grams or .112 kilograms. What is the energy equivalent of this mass in joules?

Answer 1

You need to use Einstein's famous formula:
\[E = mc ^{2}\]
where E is the energy (in Joules)
m is the mass (in kilograms)
c is the speed of light (3.0 x 10^8 m/s)