The trademark of concentrated sulfuric acid in the laboratory is shown below. Please calculate according to relevant data: (1) The quality of unopened sulfuric acid solution in reagent bottle is _ _ _ _ _ _ g. (1)500mL=500cm3, m=ρv, and the mass of sulfuric acid solution in reagent bottle before unopened is 1.84g/cm3× 500cm3 = 920g.

(2) Let the mass of concentrated sulfuric acid be X, and the mass of solute remains unchanged before and after solution dilution.

So 100g× 19.6%=x×98%? x=20g。

So the answer is: (1) 920; (2)20.