Question

Masa de hidrogen cuprinsa in 200g solutie KOV 10% este: a. 20,357g H , b. 0,357g H , c.35,7g H .........vreau cu rezolvare.....va multumesc :*

Answer 1

c%=md/ms * 100 =>md=200*10/100=20 g KOH
56 g KOH.......1 g H
20 g KOH..........x g H         x = 0,35714 g H deci raspunsul b
Sti ca in masa molara a KOH se afla 1 g H deci in masa de KOH calculata din concentratie se afla x g H.