procentul masic al unui element X dintr-o substanta:
%X=(masa de elem X din substanta/masa totala a substantei)*100
%C=(masa carbon/masa dioxid)*100=(12/44)*100=>%C=27,273%
%O=(masa oxigen/masa dioxid)*100=(32/44)*100=>%O=72,727%
%H=(masa hidrogen/masa acid)*100=(2/98)*100=>%H=2,041%
%S=(masa sulf/masa acid)*100=(32/98)*100=>%S=32,653%
%O=(masa oxigen/masa acid)*100=(64/98)*100=>%O=65,306%
Mentiune:Atat la CO2 cat si H2SO4 masa totala reprezinta chiar masa molara
