Na2S2O3 + 4Cl2 + 5H2O = 2NaHSO4 + 8HCl
how many moles of H2O react if 0.68mol HCl is formed

Ithink the answer is d.

Answerchemical energy;

Catalysts and intermediateshope i

Answer:             1.0  × 10⁻⁵ msolution:                     as we know ph is given as,                                    ph  = -log [h⁺]and,                                    [h⁺]  =  10^-ph    (1)putting value of ph in eq. 1,                                    [h⁺]  =  10⁻⁵                                    [h⁺]  =  1.0  × 10⁻⁵ m