W ilu gramach wody zawarte jest tyle samo tlenu ile jest zawarte w 80 gramach H2O2?
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34u ---- 32u
80 g ----- xg
x= 80g * 32/ 34= ok.75g
m H2O= 2+16=18 u
18u---- 16u
xg ---- 75g
x= 75*18/16= ok. 84 g :)