Question

Question #e55ba

Answer 1

141.86 MJ/kg or about 3 eV per molecule of H2

Explanation:

141.86 MJ/kg
https://en.wikipedia.org/wiki/Energy_density#Energy_densities_ignoring_external_components

`(142*10^6)/(497.5 * avogadro,constant)`
`=4.73974*10^{-19}`

`4.73974/1.6022=2.96 eV` OR about 3 eV

I put as electron volt because it is easier to compare with hydrogen energy level (of electron shells). Refer to http://hyperphysics.phy-astr.gsu.edu/hbase/hyde.html