When 25.0 g of Zn reacts, how many L of H2 gas are formed at… Questions When 25.0 g оf Zn reаcts, hоw mаny L оf H2 gаs are formed at 25 °C and a pressure of 854 mmHg? R = 0.082057 L atm mol-1K-1 Zn(s) + 2 HCl(aq) → H2(g) + ZnCl2(aq) Show Answer Hide Answer