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masa cząsteczkowa H2SO4=2*1u+32u+4*16u=98u
2NaOH + H2SO4 -> Na2SO4 + 2H2O
xg----------150g
2*40u-------98u
xg=80u*150g/98u
xg=122,4g
Odp:Do tej reakcji potrzeba 122,4g wodorotlenku sodu.