What is the concentration of hydronium ion in a 0.121 M HCl solution?
A) 1.0 M
B) < 0.121 M
C) 0.121 M
D) not enough information

C) 0.121 M

Explanation:

HCl + H₂O = H₃O⁺ + OH⁻

.121M              .121M

HCl is a strong acid . It will dissociate almost 100 % so the concentration of acid and hydronium ion formed will be equal . It is to be noted that hydronium ion is formed due to association of H⁺ and H₂O . H⁺ is formed due to ionisation of HCl .

So concentrtion of hydronium ion ( H₃O⁺ ) will be .121 M.

i think so it’s will be b yes i believe its

o conteúdo de calor de um sistema é igual à entalpia apenas para um sistema que é constante