Treba mi mala pomoc oko ova 2 zadatka...
1.Reakcijom 5 g smese Zn i Mg sa razb. H2SO4 dobijeno je 0.284g H2. Izracunajte sastav smese u masenim %
2.52 cm^3 H2SO4,gustine 1.52 g/cm^3 razblazi se vodom do 500 cm^3. Za neutralizaciju 5 cm^3 ovako dobijenog rastvora potrebno je 20 cm^3 NaOH,konc.o.5 mol/dm^3. Izracunati procentini sadrzaj polaznog rastvora
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