[ColdWater]

No, burning hydrogen does not convert mass to energy. The mass of the reactants will equal the products. 2H2 + O2 -> 2H2O There are equal amounts of each element on both sides of the equation. A nuclear reaction is not the same.

Actually, the masses are different, according the the formula E=MC².

[djf]

Correct.

And the difference in mass is represented by the chemical bonds that are formed when hydrogen burns.

[thackney]

Are you claiming the 4 hydrogen atoms and 2 oxygen atoms on the left side of the equation have a different mass than right?

E = M x C² is only applicable when converting mass to energy. A chemical reaction does not do this. It changes chemical energy as found in the molecular bonds and results in a change in heat.