Documents H atomic mass 1.00795 4x4.03180 amu He 4.00260 amu 0.0292 amu.

H atomic mass 1.00795 4x 4.03180 amu He 4.00260 amu 0.0292 amu H atomic mass 1.00795 4x 4.03180 amu He 4.00260 amu 0.0292 amu So % mass decrease = 0.0292/4.0318 (x100)% 0.0072424227392231757527655141624088…