ile gram soli należy rozpuscic w 100g wody aby otrzymac roztwór 5%
xg*100%+100g*0%=(xg+100g)5%
100x=5x+500
95x=500
x=5,26[g]
500g chyba........................
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xg*100%+100g*0%=(xg+100g)5%
100x=5x+500
95x=500
x=5,26[g]
500g chyba........................